TAPENTADOL NASAL COMPOSITION
FIELDOFTHE DISCLOSURE
Disclosed herein are pharmaceutical compositions for nasal administration compri si ng tapentadol, thei r preparati on and thei r use i n the treatment of pai n. BACKGROUNDOFTHE DISCLOSURE
Tapentadol is 3-[(1R,2R)-3-(dimethylamino)-1-ethyl-2-methylpropyl]phenol. A particularly preferred form is the hydrochloride salt, 3-[(1R,2R)-3-(dimethylamino)-1-ethyl-2-methylpropyl]phenol monohydrochloride. Tapentadol is highly soluble drug and its solubility is pH dependent. It is considered as BCS class - I drug. Tapentadol hydrochloride may be depicted structurally as follows.
Tapentadol i s a central ly acti ng analgesi c havi ng both —opioi d receptor agonist and noradrenalin (norepinephrine) reuptake inhibition activity with minimal serotonin reuptake inhibition. This dual mode of action makes tapentadol particularly useful in the treatment of both nociceptive pain and neuropathic pain. Clinical trial evidence in acute and chronic non-cancer pain, cancer related pain and neuropathic pain supports an opioid-sparing effect that reduces some of the typical opioid-related adverse effects. Specifically, the reduction in treatment-emergent gastrointestinal adverse effects for tapentadol compared with equi-

analgesic pure -opioid receptor agonist results in improved tolerability and adherence to therapy.
U.S. Patent No. 6,248,737 discloses tapentadol and its hydrochloride salt Tapentadol is available commercially as a brand name NUCY NTA+ as 50mg, 75mg and 10Omg (free base equi val ent) oral tabl et, i ndi cated for the rel i ef of moderate to severe acute pain.
Oral administration of tapentadol results in low bioavailability (32%) because of extensive first-pass metabolism where about 97% of the administered tapentadol is metabol ized. None of the metabol ites contri butes to the analgesi c activity. L i pi d sol ubi I ity of tapentadol is approximately 2.8, which is comparatively low. Being an opioid analgesic, tapentadol is useful for the treatment of severe pain such as post-operative pain, cancer pain, etc. In such cases nausea and vomiting is a frequently associated problem, and thus, poor patient compliance is seen with oral administration. Moreover, for the treatment of breakthrough pain oral formulations are inadequate because absorption occurs at least 45 minutes after administration, which is not suitable in the treatment of breakthrough pain, as this delay in absorption is typically longer than the episode of breakthrough pain. The maximum serum concentration of tapentadol is typically observed at around 1.25 hours after oral dosing. The bitter taste of tapentadol is not patient friendly, and contributes to poor patient compliance.
Generally, opioids are known to show higher inter-subject variability (Clinical Pharmacology and Therapeutics; 2007; 81; 429-444). It has been observed that the route of administration may have an impact on inter-subject variability. It has been observed that variation of absorption after intranasal route may be a greater than intramuscular or subcutaneous route (Acta Anaesthesiol Scand 2002; 46; 759-770). Like other opioids,

tapentadol also has high inter-subject variability, when given orally, as given in Tapentadol clinical study report synopsis R331333-PA 1-30003 (KF 5503/32). High clearance of the tapentadol may be one of the reasons of this high inter-subject variability.
Thus, there exists need for an alternative dosage form of tapentadol which overcomes the above problems such as bitter taste, adverse effects, etc., and moreover provides quick onset of action with reduction of inter-subject variability and improved patient compliance.
International Publication No. WO 2005/020906 discloses intranasal opioid composition for pain management with improved bioavailability and improved patient compliance.
U.S. Patent Application Publication No. 2006/0110333 discloses a composition for nasal absorption of opioid comprises calcium carbonate and/or calcium phosphate having particle size of up to 500 =m, with lower risk of developing side effects as compared to oral route.
U.S. Patent No. 5,629,011 discloses a composition for nasal administration comprises polar metabolite of opioid analgesic consists of glucoronides and ethereal sul phates of opi oi d analgesi cs.
U.S. Patent Application Publication No. 2010/0227921 discloses that tapentadol is associated with high inter-patient variability and therefore a uniform patient response may be lacking. Therefore, to overcome the problems, amino acids and peptide carbamate pro¬drugs of tapentadol are prepared.
U.S. Patent Application Publication No. 2014/0170209 discloses a nasal composi ti on compri si ng tapentadol or i ts pharmaceuti cal ly acceptabl e sal ts and at I east one nasal carrier.

It i s wel I known to the ski 11 ed person that apart from many factors, I i pi d sol ubi I ity play crucial role in the absorption of drug through nasal mucosa. Drugs with high IipophiIicity have higher tendency to get absorbed through nasal mucosa compared to almost negligible absorption of low li pophi I icity drugs. It has been tested that, intranasal f ormulati ons of I ow I i pophi I i city drugs I i ke morphi ne gives I ess bi oavai labi I ity as compared to intravenous administration, when given in solution form. Therefore they are required to be given with agent like chitosan which provides longer time for drug transport across the nasal membrane, before the formulation is cleared by the mucociliary clearance mechanism.
The information disclosed herein is based on the observation that comparable tapentadol pharmacokinetic parameters may be achieved by intranasal administration of a lower tapentadol unit dose in a human when compared to oral administration of a higher tapentadol unit dose of an immediate release dosage form. SUMMARY OF THE DISCLOSURE
Disclosed herein is, among other things, a unit dose, comprising: tapentadol or a pharmaceutical ly acceptable salt thereof in an amount that is equivalent to about 19.3 mg tapentadol free base; and at least one nasal carrier; wherein after intranasal administration to the human a tapentadol mean Cmax-value achieved by said unit dose is equivalent to or greater than a tapentadol mean C max-val ue achi eved by oral ly admi ni steri ng to the human an immediate release composition comprising tapentadol or a pharmaceutical ly acceptable salt thereof in an amount that is equivalent to 50 mg tapentadol free base. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 displays the mean plasma concentration (ng/mL) for Ex. 3 formulation at Dose Level 3S (17.5 mg/70 i L), Ex. 2 formulation at Dose Level 2S (22.5 mg/100 i L), and Comp. Ex. 4 Oral-50 mg (free base equivalent).
FIG. 2 displays the mean plasma concentration (ng/mL) for Ex. 3 formulation at
DoseLevel 3B (17.5 mg/701 L)*2 (administered to each nostril), Ex. 2 formulation at Dose
Level 2B (22.5 mg/100i L)*2 (administered to each nostril)), and Comp. Ex. 3 Oral 100
mg (free base equivalent).
Definitions
T he term "about" as used herei n refers to variati on of 20%. T he term "mostly about,
as used herein refers to variati on of 10%. In some embodiments of present invention, term
"about, may preferably be defined as "mostly about_.
A stated amount for a compositional ingredient that is not preceded by the term "about" or "mostly about, does not mean that there is no variance for the stated term, as one of ordinary skill would understand that there is always some possibility of a degree of variability generally associated with experimental error.
As disclosed herein, a "unit dose" can befilled in a vial or container which by using suitable nasal spray can be administered to a human. It is possible that a vial may contain volume of composition that has multiple "unit doses" and delivers unit dose in single or multiple sprays.
The term "administration" or "administered" or "administering" as used herein refers to administration of a unit dose of a composition described herein to a human. A skilled person will understand that said unit dose can be administered in a single spray to one nostril. A skilled person will also understand that said unit dose can be administered

in a single spray to each nostril, which is synonymous with administration to both nostrils. The unit dose may be administration over repeated time intervals, as needed.
The expression "immediate release composition comprising tapentadol" as used herein refers to Nucynta-^ for oral administration.
The concentration unit"% w/v" is a measure of the weight amount of a specified i ngredi ent based on the total vol ume of the compositi on.
The pharmaceutically acceptable salts of tapentadol, as described herein, are acid addition salts wherein acid is selected from hydrochloric acid, hydrobromic acid, embonic acid, (2S,3S)- di benzoyl tartaric acid, di benzoyl tartaric acid, sebacic acid, 1-hydroxy-naphthoic acid, phosphoric acid, L-(+)-tartaric acid, lysinic acid, L-lysinic acid, D-(+)-malic acid, 4-methylbenzenesulfonic acid, ethanesulfonic acid, benzoic acid, cinnamic acid, L-(+)-lactic acid, S-(+)-mandelic acid, (+)-camphor-10- sulfonic acid, gluconic acid, L-(+)-ascorbicacid, ascorbic acid, palmitic acid, naphthalene-1,5-disulfonicacid, hexanoic acid, oleic acid, stearic acid, gentisic acid, octanoic acid, decanoic acid, nitric acid, orotic acid, mucic acid, alginic acid and acesulfamic acid, nicotinic acid, hydrogen bromide, sulfuric acid, acetic acid, propionic acid, oxalic acid, succinic acid, fumaric acid, maleic acid, hippuric acid, lactic acid, mandelic acid, malonic acid, malic acid, tartaric acid, methanesulfonic acid, citric acid, lactic acid. Preferably hydrochloric acid addition salt of tapentadol is used for compositions described herein.
The term "composition" as used herein is defined as a solution, suspension, or dispersion.
The term "Crystal growth inhibitor" as used herein is defined as an agent; which facilitates formation of a homogenous nasal composition of tapentadol and prevents crystal formation.

The use of the terms "a" and "an" and "the" and similar references in the context of
the terms recited herei n are to be construed to cover both the si ngul ar and the pi ural, unl ess
otherwise indicated herein or clearly contradicted by context
DETAILED DESCRIPTION OF THE DISCLOSURE
The following paragraphs detail various embodiments of the disclosure. For the
avoidance of doubt; it is specifically intended that any particular feature(s) described
individually in any one of these paragraphs (or part thereof) may be combined with one or
more other features descri bed i n one or more of the remai ni ng paragraphs (or part thereof).
In other words, it is explicitly intended that the features described below individually in
each paragraph (or part thereof) represent aspects of the disclosure that may be taken in
isolation and/or combined with other aspects of the disclosure. The skilled person will
appreciate that the claimed subject matter extends to such combi nations of features and that
these have not been recited in detail here in the interests of brevity.
E mbodi ment A
A1. A unit dose, comprising: tapentadol or a pharmaceutically acceptable salt thereof in an amount that is equivalent to about 19.3 mg tapentadol free base; and at least one nasal carrier; wherein after intranasal administration to the human a tapentadol mean Cmax-value achieved by said unit dose is equivalent to or greater than a tapentadol mean Cmax-value achieved by orally administering to the human an immediate release composition comprising tapentadol or a pharmaceutical ly acceptable salt thereof in an amount that is equivalent to 50 mg tapentadol free base.
A2. The unit dose according to A1, wherein intranasal administration of the unit dose to the human provides tapentadol mean C max-val ue that ranges from about 40 ng/mL toabout65ng/mL.

A3. The unit dose according to A1, wherein a ratio of the tapentadol mean Cmax-value achieved by said intranasal administration of the unit dose to the tapentadol mean C max-val ue achieved by said oral admi nistration ranges from about 1.0 to about 2.0.
A4. The unit dose according to A1, wherein intranasal administration of the unit dose to the human provides tapentadol mean AUCo-6-value that ranges from about 115 hr*ng/mL to about 182 hr*ng/mL.
A 5. T he unit dose accordi ng to A1, wherei n a rati o of the tapentadol mean A U Co-6-value achieved by said intranasal administration of the unit dose to the tapentadol mean A U Co-6-val ue achi eved by sai d oral admi ni strati on ranges from about 0.9 to about 1.7.
A6. The unit dose according to A1, wherein intranasal administration of the unit dose to the human provi des the mean T max-val ue about 1 hr or I ess.
A7. The unit dose according to A1, wherein intranasal administration of the unit dose to the human provi des the mean T max-val ue about 0.2 hr to about 0.8 hr.
A8. The unit dose according to A1, wherein the immediate release composition compri ses tapentadol hydrochl ori de. E mbodi ment B
B1. A unit dose, comprising: tapentadol or a pharmaceutically acceptable salt thereof in an amount that is equivalent to about 19.3 mg tapentadol free base; and at least one nasal carrier; wherein after intranasal administration to each nostril of the human a tapentadol mean Cmax-value achieved by said unit dose is equivalent to or greater than a tapentadol mean Cmax-value achieved by orally administering to a human an immediate release composition comprising tapentadol or a pharmaceutical ly acceptable salt thereof in an amount that is equivalent to about 100 mg tapentadol free base.

B2. The unit dose according to B1, wherein intranasal administration of the unit dose to each nostri I of the human provi des a tapentadol mean C max-val ue that ranges from about 98 ng/mL to about 155 ng/mL.
B3. T he unit dose accordi ng to B1, wherei n a rati o of the tapentadol mean C max-value achieved by said intranasal administration of the unit dose to each nostril to the tapentadol mean C max-val ue achieved by said oral administration ranges from about 1 to about 2.
B4. The unit dose according to B1, wherein intranasal administration of the unit dose to each nostri I of the human provi des tapentadol mean A U C o-6-val ue that ranges from about 230 hr*ng/mL to about 365 hr*ng/mL
B 5. T he uni t dose accordi ng to B1, wherei n a rati o of the tapentadol mean A U C o-6-value achieved by said intranasal administration of the unit dose to each nostril of the human to the tapentadol mean AUCo-6-value achieved by said oral administration ranges from about 0.9 to about 2.0.
B6. The unit dose according to B1, wherein intranasal administration of the unit dose to each nostri I of the human provides the T max-val ue about 1 hr or I ess.
B7. The unit dose according to B1, wherein intranasal administration of the unit dose to the human provi des the mean T max-val ue about 0.2 hr to about 0.6 hr.
B8. The unit dose according to B1, wherein the immediate release composition compri ses tapentadol hydrochl ori de. E mbodi ment C
C1. A unit dose, comprising: tapentadol or a pharmaceutically acceptable salt thereof in an amount that is equivalent to about 19.3 mg tapentadol free base; and at least one nasal carrier, wherein the therapeutic efficacy of tapentadol achieved by intranasal ly

administering to one nostril or both nostrils said unit dose in a human for the treatment of pain is equivalent to the therapeutic efficacy achieved by orally administering to a human an immediate release composition comprising tapentadol or a pharmaceutically acceptable salt thereof in an amount that is equivalent to about 50 mg and about 100 mg tapentadol free base, respectively.
C2. A method of treating pain in a human in need thereof, which comprises: i ntranasal ly administering to the human the unit dose of C1.
C3. A method of treating pain in a human in need thereof, which comprises: i ntranasal ly admi nisteri ng to each nostri I of the human the unit dose of C1.
C4. The unit dose according to C1, wherein the immediate release composition compri ses tapentadol hydrochl ori de. E mbodi ment D
D1. A method of treating pain in a human in need thereof, which comprises: i ntranasal ly admi ni steri ng to the human a dose compri si ng tapentadol or a pharmaceuti cal ly acceptabl e salt thereof; wherei n the amount of tapentadol i n sai d dose is equival ent to about 19.3 mg tapentadol free base; and wherein after intranasal administration of the dose, a tapentadol mean Cmax-value achieved by said intranasal administration is equival ent to or greater than a tapentadol mean Cmax-value achieved by orally administering to a human an immediate release composition comprising tapentadol or a pharmaceuti cal ly acceptable salt thereof in an amount that is equivalent to 50 mg tapentadol free base.
D 2. T he method of D1 compri si ng i ntranasal ly admi ni steri ng the dose to the human, wherei n the tapentadol mean C max-val ue achi eved by sai d i ntranasal admi ni strati on ranges from about 40 ng/mL to about 65 ng/mL.

D3. The method of D1 comprising intranasally administering the dose to the human, wherein a ratio of the tapentadol mean Cmax-value achieved by said intranasal administration to the tapentadol mean Cmax-value achieved by said oral administration ranges from about 1.0 to about 2.0.
D4. The method of D1 comprising intranasally administering the dose to each nostri I of the human, wherei n the tapentadol mean C max-val ue achi eved by said i ntranasal admi ni strati on ranges from about 98 ng/mL to about 155 ng/mL.
D5. The method of D4 comprising intranasally administering the dose to each nostril of the human, wherein a ratio of the tapentadol mean Cmax-value achieved by said intranasal administration to the tapentadol mean Cmax-value achieved by said oral admi ni strati on ranges from about 2.5 to about 5.0.
D 6. T he method of D1 compri si ng i ntranasal ly admi ni steri ng the dose to the human, wherein the T max-val ue achieved by said intranasal administration is less than about 1 hr.
D 7. T he method of D1 compri si ng i ntranasal ly admi ni steri ng the dose to the human, wherein the T max-val ue achieved by said intranasal administration ranges from about 0.2 hr to about 0.8 hr.
D 8. T he method of D1 compri si ng i ntranasal ly admi ni steri ng the dose to the human, wherein the tapentadol mean AUCo-6-value achieved by said intranasal administration ranges from about 115 hr*ng/mL to about 182 hr*ng/mL.
D 9. T he method of D1 compri si ng i ntranasal ly admi ni steri ng the dose to the human, wherein a ratio of the tapentadol mean AUCo-6-value achieved by said intranasal administration to the tapentadol mean AUCo-6-value achieved by said oral administration ranges from about 0.9 to about 1.7.

D10. The method of D1 comprising iintranasally administering the dose to each nostril of the human, wherein the tapentadol mean AUCo-6-value achieved by said intranasal administration ranges from about 230 hr*ng/mL to about 365 hr*ng/mL.
D11. The method of D1 comprising intranasal ly administering the dose to each nostri I of the human, wherei n a rati o of the tapentadol mean A U Co-6-val ue achi eved by sai d intranasal administration to the tapentadol mean AUCo-6-value achieved by said oral admi ni strati on ranges from about 1.5 to about 3.5.
D12. The method according to D1, wherein the immediate release composition compri ses tapentadol hydrochl ori de. E mbodi ment E
E1. A method of treating pain in a human in need thereof, which comprises: intranasal ly administering to each nostril of the human a dose comprising tapentadol or a pharmaceutical ly acceptable salt thereof; wherein the amount of tapentadol in the dose is equivalent to about 19.3 mg tapentadol free base; and wherein after administration of the dose to each nostril a tapentadol mean Cmax-value achieved by said intranasal admi ni strati on is equivalent to or greater than a tapentadol mean Cmax-val ue achieved by orally administering to a human an immediate release composition comprising tapentadol or a pharmaceutical ly acceptable salt thereof in an amount that is equivalent to 100 mg tapentadol free base.
E2. The method of E1, wherein the tapentadol mean Cmax-value achieved by said intranasal administration ranges from about 98 ng/mL to about 155 ng/mL.
E 3. T he method of E1, wherei n a rati o of the tapentadol mean C max-val ue achi eved by said intranasal administration to the tapentadol mean C max-val ue achieved by said oral admi ni strati on ranges from about 1.0 to about 2.0.

E4. The method of E1, wherein the Tmax-value achieved by said intranasal admi ni strati on is less than about 1 hr.
E5. The method of E1, wherein the Tmax-value achieved by said intranasal admi ni strati on ranges from about 0.2 hr to about 0.6 hr.
E 6. T he method of E1, wherei n the tapentadol mean A U C o-6-val ue achi eved by sai d intranasal administration ranges from about 230 hr*ng/mL to about 365 hr*ng/mL.
E7. The method of E1, wherein a ratio of the tapentadol mean AUCo-6-value achieved by said intranasal administration to the tapentadol mean AUCo-6-value achieved by sai d oral admi ni strati on ranges from about 0.9 to about 2.0.
E8. The method according to E1, wherein the immediate release composition compri ses tapentadol hydrochl ori de. E mbodi ment F
F1. An intranasal composition for treating pain in a human which provides a dose reduction of tapentadol compared to an immediate release oral composition comprising a therapeutically effective dose of tapentadol or a pharmaceutically acceptable salt thereof, the intranasal composition comprising: a therapeutically effective dose of tapentadol or a pharmaceutical ly acceptable salt thereof and a pharmaceutical ly acceptable nasal carrier; wherein the ratio of the amount of tapentadol, based on the amount of tapentadol free base, in the intranasal dose to the amount of tapentadol, based on the amount of tapentadol free base, i n the oral dose i s sel ected from the group consi sti ng of about 1:1.5 or I ess, about 1:2 or less, about 1:2.5 or less, about 1:3 or less, and about 1:3.5 or less; and wherein the intranasal dose and the oral dose, when administered to the human, exhibit substantially equivalent bioavailability.

F2. The composition according to F1, wherein the intranasal composition is for treating pain in the human by producing substantially equivalent bioavailability of tapentadol in the human as the oral composition.
F3. The composition according to F1, wherein the amount of tapentadol, based on the amount of tapentadol free base, in the oral dose is from about 50 to about 150 mg, or from about 50 to about 100 mg, or from about 50 to about 75 mg.
F4. The composition according to F1, wherein each of the intranasal composition and the oral composition comprises tapentadol hydrochloride, and wherein the amount of tapentadol hydrochloride in the oral dose is about 58 to 117 mg and the amount of tapentadol hydrochloride in the intranasal dose is selected from the group consisting of about 15 to about 20 mg, about 20 to about 22.5 mg, about 22.5 to about 25 mg, about 25 mg to about 30 mg, about 30 mg to about 35 mg, about 35 mg to 40 mg, about 40 mg to 45 mg and about 45 nrg to 50 mg, and wherein the oral composition is an immediate release composition.
F5. T he compositi on accordi ng to F1, wherein the intranasal composition comprises tapentadol hydrochloride and a nasal carrier.
F6. The composition according to F1, wherein the bioavailability of the intranasal dose and the oral dose are measured after single dose administration to human..
F7. The composition according to F1, wherein the intranasal composition is for providing relief of moderate to severe pain, preferably acute pain.
F8. The composition according to F1, wherein the immediate release oral compositi on comprises tapentadol hydrochloride. E mbodi ment G

G1. An intranasal composition for treating pain in a human that provides substantially equivalent therapeutic efficacy to the therapeutic efficacy provided by an immediate release oral composition comprising a therapeutically effective dose of tapentadol or a pharmaceutically acceptable salt thereof, the intranasal composition compri si ng: a therapeutical ly effective dose of tapentadol or a pharmaceuti cal ly acceptabl e sal t thereof and a pharmaceuti cal I y acceptabl e nasal carri er; wherei n the rati o of the amount of tapentadol, based on the amount of tapentadol free base, in the intranasal dose to the amount of tapentadol, based on the amount of tapentadol free base, in the oral dose is selected from the group consisting of about 1:1.5 or less, about 1:2 or less, about 1:2.5 or less, about 1:3 or less, and about 1:3.5 or less; and wherein the intranasal dose and the oral dose, when administered to the human, exhibit substantially equivalent bioavailability.
G2. The composition according to G1, wherein the amount of tapentadol, based on the amount of tapentadol free base, in the oral dose is from about 50 to about 150 mg, or from about 50 to about 100 mg, or from about 50 to about 75 mg.
G3. The composition according to G1, wherein each of the intranasal composition and the oral composition comprises tapentadol hydrochloride, and wherein the amount of tapentadol hydrochloride in the oral dose is about 58 to about 117 mg and the amount of tapentadol hydrochloride in the intranasal dose is selected from the group consisting of about 15 to about 20 mg, about 20 to about 22.5 mg, about 22.5 to about 25 mg, about 25 mg to about 30 mg, about 30 mg to about 35 mg, about 35 mg to 40 mg, about 40 mg to about 45 mg and about 45 mg to about 50 mg, and wherein the oral composition is an immediate release composition.
G4. The composition according to G1, wherein the intranasal composition comprises tapentadol hydrochloride and a nasal carrier.

G5. The composition according to G1, wherein the bioavailability of the intranasal dose and the oral dose are measured after single dose administration to human.
G6. The composition according to G1, wherein the intranasal composition is for providing relief of moderate to severe pain, preferably acute pain.
G7. The composition according to G1, wherein the immediate release oral composition comprises tapentadol hydrochloride. E mbodi ment H
H1. A kit for administration of tapentadol or a pharmaceutically acceptable salt thereof to a human to treat pain while providing a dose reduction of tapentadol compared to an immediate release oral composition comprising a therapeutically effective dose of tapentadol or a pharmaceutically acceptable salt thereof, said kit comprising: (i) a composition for intranasal administration comprising therapeutically effective dose of tapentadol or a pharmaceuti cal ly acceptable salt thereof and a pharmaceuti cal ly acceptable nasal carrier; and (ii) a container equipped with a spray pump adapted to deliver the composition into one nostril or each nostril of the human, wherein the container is configured such that it delivers the therapeutically effective dose in one spray or in two sprays, and wherein the ratio of the amount of tapentadol, based on the amount of tapentadol free base, i n the i ntranasal dose to the amount of tapentadol, based on the amount of tapentadol free base, i n the oral dose i s sel ected from the group consi sti ng of about 1:1.5 or less, about 1:2 or less, about 1:2.5 or less, about 1:3 or less, and about 1:3.5 or less, and wherein the intranasal dose and the oral dose, when administered to the human, exhibit substantially equivalent bioavailability.
H2. The kit according to H1, wherein the spray pump isa metered multi-dose spray pump that is adapted to deliver the therapeutically effective intranasal dose in one spray.

H3. T he kit accordi ng to H1, wherei n the amount of tapentadol, based on the amount of tapentadol free base, in the oral dose is from about 50 to about 150 mg, or from about 50 to about 100 mg, or from about 50 to about 75 mg.
H4. The kit according to H1, wherein each of the intranasal composition and the oral composition comprises tapentadol hydrochloride, wherein the amount of tapentadol hydrochloride in the oral dose is about 58 to about 117 mg and the amount of tapentadol hydrochloride in the intranasal dose is selected from the group consisting of about 15 to about 20 mg, about 20 to about 22.5 mg, about 22.5 to about 25 mg, about 25 mg to about 30 mg, about 30 mg to about 35 mg, about 35 mg to about 40 mg, about 40 mg to about 45 mg and about 45 mg to about 50 mg, and wherein the oral composition is an immediate release composition.
H 5. T he kit accordi ng to H1, wherei n the i ntranasal dose provi des rel i ef of moderate to severe pai n, preferably acute pai n.
H6. The kit according to H1, wherein the composition comprises an aqueous solution of tapentadol or tapentadol hydrochloride.
H7. The kit according to H1, wherein the bioavailability of the intranasal dose and the oral dose are measured after single dose administration to human.
H8. The kit according to H1, wherein the immediate release oral composition compri ses tapentadol hydrochl ori de. E mbodi ment I
11. A method for treating pain in a human in need thereof, which provides a dose reduction of tapentadol compared to the administration of an immediate release oral composition comprising a therapeutically effective dose of tapentadol or a pharmaceutically acceptable salt thereof, the method comprising: intranasally

administering to said human a composition comprising a therapeutically effective dose of tapentadol or a pharmaceutical ly acceptable salt thereof and a pharmaceutical ly acceptable nasal carrier; wherein the ratio of the amount of tapentadol, based on the amount of tapentadol free base, i n the i ntranasal dose to the amount of tapentadol, based on the amount of tapentadol free base, i n the oral dose i s sel ected from the group consi sti ng of about 1:1.5 or less, about 1:2 or less, about 1:2.5 or less, about 1:3 or less, and about 1:3.5 or less; and wherein the intranasal dose and the oral dose, when administered to the human, exhibit substantially equivalent bioavailability.
12. The method according to 11, wherein the method is for treating pain by producing substantially equivalent bioavailability of tapentadol in human as the oral composition.
13. The method according to 11, wherein the amount of tapentadol, based on the amount of tapentadol free base, in the oral dose is from about 50 to about 150 mg, or from about 50 to about 100 mg, or from about 50 to about 75 mg.
14. T he method accordi ng to 11, wherei n each of the i ntranasal compositi on and the oral composition comprises tapentadol hydrochloride, and wherein the amount of tapentadol i n the oral dose is about 58 to about 117 mg and the amount of tapentadol i n the intranasal dose is sel ected from the group consi sting of about 15 to about 20 mg, about 20 to about 22.5 mg, about 22.5 to about 25 mg, about 25 mg to about 30 mg, about 30 mg to about 35 mg, about 35 mg to about 40 mg, about 40 mg to about 45 mg and about 45 nrg to about 50 mg, and wherein the oral composition is an immediate release composition.
15. The method according to 11, wherein the intranasal composition comprises tapentadol hydrochloride and a nasal carrier.

16. The method according to 11, wherein the bioavailability of the intranasal dose and the oral dose are measured after single dose administration to human.
17. The method according to 11, wherein the method provides relief of moderate to severe pai n, preferably acute pai n.
18. The method according to 11, wherein the immediate release oral composition compri ses tapentadol hydrochl ori de.
Embodiment J
J1. A method for treating pain in a human which provides therapeutic efficacy substantially equivalent to the therapeutic efficacy provided by the administration of an immediate release oral composition comprising a therapeutically effective dose of tapentadol or a pharmaceutically acceptable salt thereof, the method comprising: intranasally administering to said human a composition comprising a therapeutically effective dose of tapentadol or a pharmaceutical ly acceptable salt thereof and a pharmaceutical ly acceptable nasal carrier; wherein the ratio of the amount of tapentadol, based on the amount of tapentadol free base, in the intranasal dose to the amount of tapentadol, based on the amount of tapentadol free base, in the oral dose is selected from the group consisting of about 1:1.5 or less, about 1:2 or less, about 1:2.5 or less, about 1:3 or less, and about 1:3.5 or less; and wherein the intranasal dose and the oral dose.
J 2. The method according to J 2, wherein the amount of tapentadol, based on the amount of tapentadol free base, in the oral dose is from about 50 to about 150 mg, or from about 50 to about 100 mg, or from about 50 to about 75 mg.
J 3. T he method accordi ng toj 1, wherei n each of the i ntranasal compositi on and the oral composition comprises tapentadol hydrochloride, and wherein the amount of tapentadol hydrochloride in the oral dose is about 58 to about 117 mg and the amount of

tapentadol hydrochloride in the intranasal dose is selected from the group consisting of about 15 to about 20 mg, about 20 to about 22.5 mg, about 22.5 to about 25 mg, about 25 mg to about 30 mg, about 30 mg to about 35 mg, about 35 mg to 40 mg, about 40 mg to 45 mg and about 45 mg to about 50 mg, and wherein the oral composition is an immediate release composition.
J4. The method according to J1, wherein the intranasal composition comprises tapentadol hydrochloride and a nasal carrier.
J 5. The method according to J1, wherein the bioavailability of the intranasal dose and the oral dose are measured after single dose administration to human.
J 6. The method according to J1, wherein the method provides relief of moderate to severe pai n, preferably acute pai n.
J 7. The method according to J1, wherein the immediate release oral composition compri ses tapentadol hydrochl ori de. E mbodi ment K
K1. A method of increasing the bioavailability of tapentadol inahuman, comprising intranasally administering to said human a pharmaceutical composition comprising a therapeutically effective dose of tapentadol or a pharmaceutically acceptable salt thereof and a pharmaceutical ly acceptable nasal carrier, whereinthe bioavailability of the intranasal dose is increased compared to the bioavailability of an equivalent dose of an immediate release oral composition comprising a therapeutically effective dose of tapentadol or a pharmaceuti cal ly acceptabl e salt thereof.
K2. The method according to K1, wherein the ratio of the mean AUCo-6 of tapentadol after the intranasal administration to the mean AUCo-6 of tapentadol after the

oral administration is selected from the group consisting of at least about 1.5:1, at least about 2:1, at least about 2.5:1, at least about 3:1 and at least about 3.5:1.
K3. The method according to K1, wherein the intranasal composition comprises tapentadol hydrochloride and a nasal carrier.
K4. The method according to K1, wherein the mean AUCo-6 of the intranasal dose and the mean AUCo-6 of the oral dose are measured after single dose administration to human.
K5. The method according to K1, wherein immediate release oral composition compri ses tapentadol hydrochl ori de.
In a general embodi ment; unit dose, dose or therapeuti cal ly effective dose accordi ng to any of the embodi ments descri bed herei n above may compri se tapentadol hydrochl ori de in an amount that is equivalent to about 15 nrg to about 20 nrg of tapentadol free base or any value in between, including, for example 15.0, 15.5, 16.0, 16.5, 17.0, 17.5, 18.0, 18.5u „upto20.0mg. Compositions
Compositions disclosed herein contain tapentadol or its pharmaceutical ly acceptable salt(s) in an amount equivalent to about 0.9 to about 49.9% w/v of tapentadol free base, or any values in between, including, for example, 1.0,1.1,1.2.,u up to 15,15.1, 15.2,u up to 19.3, 19.4, 19.5,u up to 21.5, 21.6, 21.7,u up to 33.1, 33.2, 33.3,u up to 49.9% w/v. Compositions exemplified herein contain an amount of tapentadol free base of 15% w/v, 19.3% w/v, 21.5% w/v, and 33.1% w/v. Most preferably, composition contains about 19.3% w/v of tapentadol free base.

Compositions or unit dose according to any of the embodiment are comprised of a nasal carrier (or pharmaceutically acceptable nasal carrier) selected from a mucoadhesive agent, a solubilizer, a sweetener, a preservative, a flavoring agent; and a vehicle.
Examples of mucoadhesive agent include, but are not limited to such as polyacrylic polymers like carbopols, polycarbophil, carboxymethyl cellulose or its pharmaceutical ly acceptable salt, microcrystalline cellulose, hydroxyethylcellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose (i.e., hypromellose), methyl cellulose, poloxamers, pectin, xanthan gums, alginates, gelatin alone or in any combination thereof. A preferred mucoadhesive agent is selected from hydroxypropyl methyl cellulose and carboxymethyl cellulose or its pharmaceutical ly acceptable salt.
Nasal compositions disclosed herein contain about 0.05 to about 5% w/v of a mucoadhesive agent or any values between, including, for example, 0.1, 0.15, 0.2, 0.25, 0.30, 0.35, 0.4,u up to 5% w/v. Anamountof a mucoadhesive agent exemplified herein is about 0.1% w/v of hydroxypropyl methyl cellulose.
Examples of solubilizers (or crystal growth inhibitors) include, but are not limited to d-alpha tocopheryl polyethylene glycol 1000 succinate (Vitamin E TPGS), macrogol (15)-hydroxystearate (Solutol HS 15), polyoxyethylene-polyoxypropylene copolymer (Poloxamer, Pluronic, such as poloxamer 188), PEO-PLLA diblock copolymer, PEG-PLGA-PEG triblock,copolymer, cyclodextrins, hydroxypropyl betadex, polyoxyethylene castor oil derivatives, povidone,, sulfobutylether-b-cyclodextrin, tricaprylin, triolein, glyceryl monostearate, sorbitan esters (sorbitan fatty acid esters), polyoxyethylene fatty acid esters, polysorbate 80, polysorbate 20 or macrogol-15-hydroxysterate, alone or in combination thereof. A preferred solubilizer is polyoxyethylene-polyoxypropylene copolymer, such as, poloxamer 188.

It is observed that increase in concentration of the tapentadol in the solution leads to formation of crystals, when stored for extended duration (for more than 3 days). This makes the formulation non-homogeneous and therefore non-suitable for nasal administration. This crystal growth may further lead to altered therapeutic effect of the drug. The solubilizer may function as a crystal growth inhibitor, which permits manufacture of a composition having a higher concentration and that permits long term storage.
Nasal compositions disclosed herein contain from about 0.2 to about 10.0% wA/ of a solubilizer or any values between, including, for example, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9,u up to 10.0% wA/. An amount of a solubilizer exemplified herein is about 0.6% w/v.
The sweetener is selected from the group comprising of aspartame, saccharin sodium, acesulfame potassium, dried invert sugar, dextrose, glucose, fructose, galactose, levulose, maltose, neotame, sucralose, neotameand mixture thereof. Preferred sweetener is sucralose. Another preferred sweetener is neotame.
Nasal compositions disclosed herein contain from about 0.1% to about 1% of a sweetener or any values between, including, for example, 0.2, 0.3, 0.4, 0.5, 0.6,u up to 1.0% w/v. An amount of a sweetener exemplified herein is about 0.5% wA/.
Suitable preservatives include, but are not limited to, benzalkonium chloride, sodium benzoate, methyl, ethyl, propyl or butyl paraben, benzyl alcohol, phenyl ethyl alcohol, benzethonium chloride, chlorobutanol, potassium sorbate or combination thereof. A preferred preservative is benzalkonium chloride.
Nasal compositions disclosed herein contain from about 0.01 to about 1% wA/ of a preservative or any values between, including, for example, 0.02, 0.03, 0.04, 0.05,u up to

0.1, and 0.2,0.3, 0.4, 0.5,0.6, upto1% wA/. An amount of a sweetener exemplified herein is about 0.5% wA/.
Examples of flavoring agent(s) include, but are not limited to flavor anise, flavor apple, flavor apricot, flavor Banana, flavor bitter mask, flavor buttermint, flavor citrus, flavor orange, flavor menthol mint; flavor mint; flavor peppermint; flavor spearmint, alone or in any combination thereof. A preferred flavor is flavor spearmint.
Nasal compositions disclosed herein contain from about 0.01% w/v to about 0.5% w/v of a flavoring agent or any values between, including, for example, 0.02, 0.03, 0.04, 0.05, 0.6, 0.07, 0.08, 0.09, 0.10,0" up to 0.5% w/v. An amount of a flavoring agent exemplified herein is about 0.1% w/v.
Examples of vehicles include, but are not limited to, saline, water, dextrose or combinations thereof. A preferred vehicle is purified water. The amount of vehicle depends on the amounts of the other ingredients found in the nasal composition. The amount of vehicle is a sufficient amount (q.s.) that is required to establish a specified vol ume.
The pH of compositions described herein may be about 3.0 to about 7.4 and all values in between, including, for example, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7,u up to 7.4. A preferred pH of compositions described herein may be about 4.5. The pH may be adjusted usi ng a pH adj usti ng agent; i ncl udi ng, for example, hydrochl ori c aci d or sodi um hydroxi de. In certai n i nstance, it may be useful to i ncl ude a bufferi ng agent i n an amount that preferably does not irritate the nasal mucosa. A buffering agent includes an agent that resists changes to pH. Exemplary buffering agents include, but are not limited to, salts of citrate, acetate, or phosphate. More preferred buffering agents are selected from sodium citrate, sodium acetate, sodium phosphate, and/or combinations thereof.

T hus, the unit dose or composition accordi ng to any of the embodi mentis) disclosed herein comprising tapentadol or a pharmaceutical I y acceptable salt thereof in an amount equivalent to about 19.3 % w/v tapentadol free base and a nasal carrier, wherein the nasal carrier is selected from about 0.05 to about 5% w/v of a mucoadhesive agent; from about 0.2 to about 10.0% w/v of a sol ubi I izer; from about 0.1 % to about 1 % of a sweetener; from about 0.01 to about 1% w/v of a preservative, from about 0.01% w/v to about 0.5% w/v of a flavoring agent, and a sufficient amount of a water vehicle. Preferably, unit dose or composition comprises mucoadhesive agent selected from hydroxypropylmethyl cellulose and carboxy methyl cellulose or its pharmaceutical ly acceptable salt; the sol ubi I izer comprises a poloxamer, the sweetener selected from sucralose and neotame, preservative compri ses benzal koni um chl ori de and the f I avori ng agent compri ses a spearmi nt f I avor.
Most preferably, unit dose or composition according to any of the embodiments comprises nasal carrier selected from about 0.1% w/v hydroxypropyl methyl cellulose, about 0.6% w/v of a poloxamer, about 0.5% w/v of a sweetener, about 0.02% w/v of a preservative, and a sufficient amount of a water vehicle.
Compositions described herein provide a quick onset of action as compared to an immediate release oral composition, in which the Cmax can be achieved in a shorter period of time as compared to oral administration. Composition or unit dose disclosed herein provides mean Cmax-value that ranges from about 40 ng/mL to about 65 ng/mL or about 98 ng/mL to about 155 ng/mL; mean A UCo-6-value that ranges from about 115 hr*ng/mL to about 182 hr*ng/mL or about 230 hr*ng/mL to about 365 hr*ng/mL and Tmax-value about 1 hr or less.
Compositions disclosed herei n provide for a unit dose i n a vol ume of from about 25 i L to about 150 i L, or any values between, including, for example, 30 i L, 35 i L, 40

I L,u up to 70 I L, 75 I L, 80 I L,u up to 100 I L, 105 I L, 110 I L,u up to 150 I L. Exemplified embodiments described herein administer a unit dose of either about 701 L or about 100 i L or about 140 i L, to one or both nostrils. The compositions or unit dose described herein, when administered intranasally has a spray having an ovality ratio between about 1 to about 2, or between about 1 to about 1.5 or between about 1 to about 1.3 when measured at about 2.5 cm, and wherei n the spray produces droplets of which less than about 10%, preferably less than about 5%, more preferably less than about 2%, have a diameter of less than about 10 i m.
T he compositions or unit dose descri bed herei n, when admi nistered i ntranasal ly has a spray comprising a mist of droplets of which less than about 10%, preferably less than about 5%, more preferably less than about 2%, have a diameter of less than about 10 i m, and wherein the droplets are characterized by (i) Dv(50) of between about 40 i m to about 150 i m, preferably between about 50 i m to about 120 i m; and/or (i i) Dv(90) of less than about 350 i m. Droplet size distribution is measured using Laser diffraction method with Spraytec-^.
A kit described herein may further comprise instruction for use, for example in the form of an i nsert or label.
Compositions or unit dose described herei n may be useful for the treatment of pai n, and parti cularly acute pai n. T he acute pai n is sel ected from but not I i mi ted to breakthrough cancer pain, dental pain or pain associated with the medical conditions which include day care surgeries, appendicectomy, cholecystectomy, nailing, plating, fixation of fractured bone, burns dressing, jejunostomy dressing and wound dressing.
Described herein are processes for preparing compositions. Composition can be in the form of a dry powder with suitable particle size or can be in liquid form. Preferably, a

unit dose or a composition is in liquid forrn which can be a suspension, a solution or a
dispersion. The process comprises the step of mixing tapentadol or its pharmaceutically
acceptable salt(s) with at least one nasal carrier. Tapentadol or its pharmaceutical ly
acceptable salt(s) and nasal carrier can be mixed in any order to prepare final mixture,
solution, suspension or dispersion. In an embodiment, a composition or a unit dose is
prepared by mixing a mucoadhesive agent and a solubilizer to prepare a solution or a
dispersion; adding tapentadol or its pharmaceutical ly acceptable salt with said solution or
dispersion. Optionally drying the solution or the dispersion with a suitable drying technique
i ncl udi ng freeze dryi ng or spray dryi ng.
The compositions or unit dose described herein can be administered through a nasal
spray or any suitable nasal applicator. Nasal composition can be of multi dose container or
unit dose container, preferably in multi dose container.
Examples
A spects of the di scl osure are i 11 ustrated by the f ol I owi ng exampl es.
Examples 1-4. Tapentadol Hydrochloride Formulations

Examples Ex. 1 Ex.2 Ex.3 Ex.4
Ingredient %, w/v %, W/V %, W/V %, W/V
Tapentadol Hydrochloride 22.5% 25% 38.5%
Hypromellose 0.1% 0.1% 0.1% 0.1%
Poloxamer188 0.6% 0.6% 0.6% 0.6%
Neotame 0.5% 0.5% 0.5% 0.5%
Benzalkonium 0.02 chloride solution 0.02% 0.02% 0.02%
Novami nt spearmi nt 0.01% flavour 0.1% 0.1% 0.1%
Purified water Q.s to
100% Q.s. to 100% Q .s. to 100% Q .s. to 100%
pH 4.66 4.63 4.65 4.44
Packaging3 100 IL 100 I L 100 I L and 7 0 IL 100 I Land 140 I L
Delivered dose 17.5mg/spray 22.5 nrg/spray 25 nrg/spray and 17.5 nrg/spray 38.5 mg/spray and 50 nrg/spray
aFilled in Multidose container with specifiec I volume nasal pump.

The respective concentrations of tapentadol hydrochloride in the exemplified embodiments are: Ex. 1 (175 mg/mL), Ex. 2 (225 mg/mL), Ex. 3 (250 mg/mL), and Ex. 4 (385 mg/mL). In certain instances, it is convenient to determine the concentration of tapentadol in the respective exemplified embodiments. This may be achieved by multiplying the concentration of tapentadol hydrochloride by the molecular weight of tapentadol free base (221.34 mg/mmol), and then dividing by the molecular weight of tapentadol hydrochloride (257.80 mg/mmol). In view of this relationship, the respective concentrations of tapentadol (free base) in the exemplified embodiments are: Ex. 1 (150.3 mg/mL), Ex. 2 (193.2 mg/mL), Ex. 3 (214.6 mg/mL), and Ex. 4 (330.6 mg/mL). Procedure: Tabulated quantity of hypromellose (hydroxy propyl methyl cellulose) was di ssol ved i n puri f i ed water. Pol oxamer 188 was added i nto the obtai ned sol uti on and sti rred to form homogenous solution. In the obtained solution, neotame was added. Tapentadol hydrochloride was dissolved in obtained solution, followed by addition of benzalkonium chlori de and novami nt spearmi nt flavor. V ol ume of the sol uti on was made up with purif i ed water. Spray Patterns

Example Ex. 1a Ex. 2a Ex. 3a Ex.4a Ex.4b
Distance D,cm D,cm D, cm D,cm D,cm
2.5 5 2.5 5 2.5 5 2.5 5 2.5 5
Ovality ratio Dmax, cm Dmin, cm 1.03 1.08 3.2 4.9 3.1 4.5 1.03 1.02 3.2 4.9 3.1 4.8 1.00 1.04 3.5 4.9 3.5 4.7 1.07 1.09
3.8 4.5
3.0 4.1 1.13 1.06 3.3 6.4 2.9 5.8
aPump used: A bPump used: A ptar 100 i L CPS pump (at 2.5 ptar 140 i L CPS pump (at 2.5 cm and 5 cm cm and 5 cm distances). distances).
Droplet size distribution (DSD) by laser diffraction

Ex.
D, cm Dv(10), i m Dv(50), i m Dv(90), i m Span %V < 10i (%)
Ex. 1 3 23.98 62.30 153.13 78.35 2.07
6 31.12 61.40 134.70 76.29 1.69
Ex.2 3 24.84 65.70 162.77 83.26 2.10
6 30.80 60.80 135.13 75.19 1.72
Ex. 3a 3 29.85 86.57 182.97 1.76 0.55
6 35.05 79.36 169.60 1.69 0.56
Ex. 3b 3 32.99 95.42 191.73 105.43 1.66
6 30.91 77.35 173.13 91.26 1.84
Ex. 4a 3 35.20 112.60 232.20 1.74 0.43
6 35.93 96.25 208.93 1.79 0.91
Ex. 4C 3 36.23 116.27 284.57 2.13 0.57
6 34.97 102.01 241.07 1.99 1.11
a100 i L Pump. b70 i L Pump. c140 i L Pump.
Effect of device parameters: The observed spray patterns for each composition shows that
the oval ity ratio isaboutl, which signifies that at different distances of administration the
spray pattern remains the same, and which assures the effective distribution of droplets in
nostril(s) and thus reducing the variability in absorption. The observed droplet size
distribution (DSD) values for each composition shows effective formation of droplet size.
Generally, smaller droplets tend to deposit in the lower turbinate in nasal mucosa which is
having slower clearance than middleand upper turbinate, for systemic delivery itisalways
preferable that maximum deposition to be carried out in middle turbinate.
Single dose PK parameters of Oral formulation (Source Nucynta-^ FDA Clinical Pharmacology and Biopharmaceutics Review ("CPBR") for NDA 22-304)

Parameters For 21.5 mg,a Comp. Ex. 1 DNto19.3mg,b Comp. Ex. 2 For 100mg,c Comp. Ex. 3 DNto50mg,d Comp. Ex. -4
Cmax(ng/ml) 17.1 e 6.7 15.3 e 6.0 95.1 e21.3 47.6 e 10.6
AUC0-6(hr(ng/ml) 57.5 e 23.3 51.6 e 20.9 299 e 87.5 149.5 e 43.7
aSect. 2.3.2.2 of CPBR (Study KF5503/08).
bDose Normalized (DN) values calculated from 21.5 mg values using a proportion and propagating errors.

cSect. 2.2.5.3 of CPBR (Study HP5503/13).
dDN values calculated from 100 mg values using a proportion and propagating errors.
A 50-mg dose tapentadol free base is equivalent to 58.24-mg dose of tapentadol hydrochloride, while a 100-mg dose of tapentadol free base is equivalent to 116.48-nrg tapentadol hydrochloride. Pharmacokinetic Data after Nasal Administration
Formulations were tested in human for the following objectives: (i) dose reduction from intranasal route in comparison to oral administration; (ii) effect of administration volume; (iii) effect of concentration; and (iv) effect of surface area.
In a pharmacokinetic (PK) study, 4 groups having eight (6+2) healthy adults each, were given an intranasal dosage level as summarized below.

Dose Level

Ex. Formulation

Dosage Volume

TapHCI (mg)

TapFB (mg)

3S 3 (250 mg/mL) 70 i L in single nostril 17.5 15
2S 2 (225 mg/mL) 100 i L in single nostril 22.5 19.3
3B 3 (250 mg/mL) 70 i L in both nostrils 35 30
2B 2 (225 mg/mL) 100 i L in both nostrils 45 38.6
Samples were collected prior to administration and up to 16-hrs post-dosing. Samples were analyzed for tapentadol content using LC-MS/MS. The PK data from that study are shown i n the f ol I owi ng tabl e. Pharmacokinetic data of Formulation Examples 2 and 3

Parameters Dose Level 3S, 17.5mg/70i L Dose Level 2S,
22.5mg/100
i L Dose Level
3B,(17.5
mg/70 i L )*2 Dose Level
2B, (22.5
mg/100i L)*2
Tmax (hr) 0.50 (0.25-0.50) 0.63 (0.08-1.50) 0.12 (0.08-1.0) 0.25 (0.16-0.50)
Cmax(ng/iml) 44.76 e 22.52 50.78 e 41.0 112.07 e 53.53 123.16 e 54.39
AUC0-6(hr®ig/ml) 120.57 e 37.73 145.42 e 60.70 266.25 e 97.91 290.19 e 60.33

AUCt(hr®g/ml) 173.46 e 52.19 213.84 e 81.63 379.23 e 129.26 415.54 e 82.28
AUCinf(hr®g/ml) 185.20 e 55.42 228.35 e 85.52 400.51 e 130.43 446.93 e 89.33
FIG. 1 di spl ays the mean pi asma concentrati on (ng/mL) after the admi ni strati on of: (i) Ex. 3 formulation at Dose Level 3S, 17.5 mg tapentadol hydrochloride (equivalentto 15 mg tapentadol free base) administered to a single (S) nostril using a dosage volume of 70 i L; (ii) Ex. 2 formulation at Dose Level 2S, 22.5 mg tapentadol hydrochloride (equivalent to 19.3 mg tapentadol free base) administered to single (S) nostril using a dosage volume of 100 i L; and (iii) Comp. Ex. 4 (oral administration of immediate release composition containing 50 nrg tapentadol free base).
FIG. 2 di spl ays the mean pi asma concentrati on (ng/mL) after the admi ni strati on of: (i) Ex. 3 formulation at Dose Level 3B, 17.5 nrg tapentadol hydrochloride administered to both (B) nostri I s usi ng a dosage vol ume of 701 L for each nostri I (total dosage amount 35 mg tapentadol hydrochloride (equivalent to 30 nrg tapentadol free base); (ii) Ex. 2 formulation at Dose Level 2B, 22.5 mg tapentadol hydrochloride administered to both (B) nostrils using a dosage volume of 100i L for each nostril (total dosage amount: 45 nrg tapentadol hydrochloride (equivalent to 38.6 tapentadol free base); and (iii) Comparative Example 3 (oral administration of immediate release composition containing 100 mg tapentadol free base).
Based on the results presented for Dose Level 2S compared to Comparative Example, 1, it can be seen that a single dose at Dose Level S (i.e., 19.3 mg tapentadol free base) achieves a maximum plasma concentration of 50.78 e 41.0 ng/mL, while the same amount of orally administered tapentadol achieves a Cmax of about 15.3 ng/mL. Accordingly, the mean Cmax value achieved by intranasally administering Dose Level 2S

i s at I east about two-ti mes greater than the mean C max achi eved by oral ly admi ni steri ng to a human a single dose of an immediate release composition comprising tapentadol or a pharmaceutical ly acceptable salt thereof in an amount that is equivalent to about 19.3 mg tapentadol free base. More specifically, the mean Cmax value achieved by intranasal ly admi ni steri ng D ose L evel 2S i s about three-ti mes greater than the mean C max achi eved by orally administering to a human a single dose of an immediate release composition comprising tapentadol or a pharmaceutical ly acceptable salt thereof in an amount that is equivalent to about 19.3 nrg tapentadol free base.
Based on the results presented for Dose Levels 2S and 2B compared to Comparative Examples 4 and 3, respectively, the following conclusions may be readily ascertained. Early onset of action was achieved with intranasal formulation versus oral formulation. T he observed PK parameters for Dose Level 2S (Ex. 2 Formulation at total dosage amount of 22.5 mg tapentadol hydrochloride (equivalent to 19.3 nrg tapentadol free base)) were comparable to the PK parameters normalized for Comparative Ex. 4 (oral formulation 50 mg tapentadol free base). The observed PK parameters for Dose Level 2B (Ex. 2 Formulation at total dosage amount of 45 nrg tapentadol hydrochloride (equivalent to 38.6 mg tapentadol free base)) were comparable to the PK parameters observed for Comparative Ex. 3 (oral formulation 100 mg tapentadol free base).
Alternative embodiments, examples, and modifications which would still be encompassed by the disclosure may be made by those skilled in the art; particularly in light of the foregoing teachings. Further, it should be understood that the terminology used to descri be the discl osure is i ntended to be i n the nature of words of descri pti on rather than of limitation.

Those skilled in the art will also appreciate that various adaptations and modifications of the preferred and alternative embodiments described above can be configured without departi ng from the scope and spi rit of the disclosure. Therefore, it is to be understood that, within the scope of the embodiments described herein, the disclosure may be practiced other than as specifically described herein.

CLAIMS
1. An intranasal composition comprising tapentadol or a pharmaceutical I y acceptable salt thereof and at least one nasal carrier; wherein unit dose of said composition comprises tapentadol or a pharmaceutically acceptable salt in an amount that is equivalent to about 19.3 mg tapentadol free base.
2. The composition according to claim 1, wherein after intranasal administration to the human, a tapentadol mean Cmax-value achieved by said unit dose is equivalent to or greater than a tapentadol mean Cmax-value achieved by orally administering to the human a single dose of an immediate release composition comprising tapentadol or a pharmaceutical ly acceptable salt thereof in an amount that is equivalent to 50 mg tapentadol free base.
3. The composition according to claim 2, wherein after intranasal administration to the human, a tapentadol mean Cmax-value achieved by said unit dose ranges from about 40 ng/mL to about 65 ng/mL.
4. The composition according to claim 1, wherein after intranasal administration to the human, a tapentadol mean A U Co-6-val ue achi eved by sai d unit dose ranges from about 115 hr*ng/mL to about 182 hr*ng/mL.
5. The composition according to claim 1, wherein after intranasal administration of the unit dose to each nostril of the human, a tapentadol mean Cmax-value achieved by said unit dose is equivalent to or greater than a tapentadol mean Cmax-value achieved by orally administering to a human a single dose of an immediate release composition comprising tapentadol or a pharmaceutical I y acceptable salt thereof in an amount that is equivalent to about 100 mg tapentadol free base.
6. The composition according to claim 5, wherein after intranasal administration of the unit dose to each nostril of the human, a tapentadol mean Cmax-value achieved by said unit dose ranges from about 98 ng/mL to about 155 ng/mL.
7. The composition according to claim 5, wherein after intranasal administration of the unit dose to each nostri I of the human, a tapentadol mean A U Co-6-val ue achi eved by said unit dose ranges from about 230 hr*ng/mL to about 365 hr*ng/mL.

8. T he composition accordi ng to any of the precedi ng clai ms, wherei n after i ntranasal administration to the human, the mean Tmax-value achieved by said unit dose is about 1 hr or less.
9. The composition according to claim 8, wherein after intranasal administration to the human, the mean T max-val ue achieved by said unit dose is about 0.2 hr to about 0.8 hr.
10. An intranasal composition comprising tapentadol or a pharmaceutical I y acceptable salt thereof and at least one nasal carrier; wherein unit dose of said composition comprises tapentadol or a pharmaceutically acceptable salt thereof in an amount that is equivalent to about 19.3 nrg tapentadol free base, wherein the therapeutic efficacy of tapentadol achieved by i ntranasal ly administering to one nostril or both nostrils said unit dose in a human for the treatment of pain is equivalent to the therapeutic efficacy achieved by orally administering to a human a single dose of an immediate release composition comprising tapentadol or a pharmaceutical ly acceptabl e salt thereof i n an amount that is equival ent to about 50 mg and about 100 nrg tapentadol free base, respectively.
11. An intranasal composition comprising tapentadol or a pharmaceutical I y acceptable salt thereof and at least one nasal carrier; wherein unit dose of said composition comprises tapentadol or a pharmaceutical ly acceptable salt thereof in an amount that is equivalent to about 19.3 mg tapentadol free base, for use in the treatment of pain, wherein composition is administered intranasal ly.
12. The composition according to claim 11, wherein after intranasal administration to the human, a tapentadol mean C max-val ue achieved by said unit dose is equivalent to or greater than a tapentadol mean Cmax-val ue achieved by orally administering to a human a single dose of an immediate release composition comprising tapentadol or a pharmaceutical ly acceptable salt thereof in an amount that is equival ent to 50 mg tapentadol free base.
13. The composition according to claim 12, wherein after intranasal administration to the human, a tapentadol mean C max-val ue achieved by said unit dose ranges from about 40 ng/mL to about 65 ng/mL.

14. The composition according to claim 11, wherein after intranasal administration to the human, a tapentadol mean A U Co-6-val ue achi eved by sai d unit dose ranges from about 115 hr*ng/mL to about 182 hr*ng/mL.
15. The composition according to claim 11, wherein after intranasal administration of the unit dose to each nostril of the human, a tapentadol mean Cmax-value achieved by said unit dose is equivalent to or greater than a tapentadol mean Cmax-value achieved by orally administering to a human a single dose of an immediate release composition comprising tapentadol or a pharmaceutical I y acceptable salt thereof in an amount that is equivalent to 100 mg tapentadol free base.
16. The composition according to claim 15, wherein after intranasal administration of the unit dose to each nostril of the human, a tapentadol mean Cmax-value achieved by said unit dose ranges from about 98 ng/mL to about 155 ng/mL.
17. The composition according to claim 15, wherein after intranasal administration of the unit dose to each nostri I of the human, a tapentadol mean A U Co-6-val ue achi eved by said unit dose ranges from about 230 hr*ng/mL to about 365 hr*ng/mL
18. The composition according any of preceding claims, wherein the nasal carrier is selected from about 0.05 to about 5 % w/v of a mucoadhesive agent; from about 0.2 to about 10.0 % w/v of a sol ubi I izer; from about 0.1 % to about 1 % of a sweetener; from about 0.01 to about 1 % w/v of a preservative, from about 0.01 % w/v to about 0.5 % w/v of a flavori ng agent and a sufficient amount of a water vehicle.
19. T he compositi on accordi ng to cl ai m 18, wherei n the mucoadhesi ve agent i s sel ected from hydroxypropylmethyl cellulose and carboxymethyl cellulose or its pharmaceutical I y acceptable salt, the sol ubi I i zer comprises a poloxamer, the sweetener is selected from sucralose and neotame, preservative comprises benzalkonium chloride and the flavoring agent comprises a spearmint flavor.