FORM 2

THE PATENT ACT, 1970
(39 OF 1970)
AND
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. TITLE OF THE INVENTION:
"BIOEQUIVALENT PHARMACEUTICAL COMPOSITION OF VORTIOXETINE
HYDROBROMIDE"
2. APPLICANT(S)
(a) Name: UNICHEM LABORATORIES LIMITED
(b) Nationality: An Indian Company
(c) Address: Unichem Bhavan, Prabhat Estate, Off. S.V. Road, Jogeshwari (W),
Mumbai-400102, Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the invention and the manner in
which it is to be performed.

TITLE OF THE INVENTION
Bioequivalent pharmaceutical composition of vortioxetine hydrobromide.
FIELD OF THE INVENTION
The present invention relates to vortioxetine hydrobromide having particle size distribution of D98 100-200^, D50 35-90^ and D5 7-30^ and a stable, reproducible and bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide having PSD of D98 100-200n, D50 35-90^ and D5 7-30^ and one or more pharmaceutical^ acceptable excipients. More particularly the present invention relates to a bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide and one or more pharmaceutically acceptable excipients wherein vortioxetine hydrobromide has particle size distribution of D98 100-200^, D50 35-90^ and D5 7-30^.
BACKGROUND OF THE INVENTION
Vortioxetine hydrobromide l-[2-(2,4-Dimethyl-phenylsulfanyl)-phenyl]-piperazine5 hydrobromide is used in the treatment for major depressive disorder, is claimed generically as well as specifically in US7144884. Its equivalent US8476279 and IN227963 claimed pharmaceutical composition. Both these patents are silent on stability aspects of composition and how to prepare the composition. They are also silent on the aspects of polymorphic stability of vortioxetine hydrobromide either as compound or when present in the composition.
US8722684 claims vortioxetine hydrobromide characterized by certain XRPD peaks stated numerically as well as by referring to figures stated in the patent. It also claims The compound according to claim 2, which compound has a particle size distribution corresponding to D98%: 650-680 \im; D50%: 230-250 urn; and D5%: 40-60 urn; D98%: 370-390 urn; D50%: 100-120 jim; and D5%: 5-15 jim; D98%: 100-125 \im; D50%: 15-25 jim; and D5%: 1-3 ^m; or D98: 50-70 jam; D50%: 3-7 jam; and D5%: 0.5-2 |im. It also claims compositions with specific contents of specified ingredients. It also claims compositions prepared by wet granulations. In the detailed description it specifically states that "The size of the crystals used for preparing tablets comprising
compounds of the present invention are of significance. If the crystals are too small they may stick to the plunger in the tablet machines. On the other hand, they cannot be too large either. The dissolution rate in the intestines decrease when crystal size increases. Hence, if the crystals are too large it may compromise the bioavailability of the compounds. Particle size distribution may be described using quantiles, e.g. D5%, D10%, D50%, D90%: D95% and D98%. As used herein, ''particle size distribution" means the cumulative volume size distribution of equivalent spherical diameters as determined by laser diffraction at 1 bar dispersive pressure in a Sympatec Helos equipment." It has not substantiated the said invention by vortioxetine of the said PSD ranges.
WO2014177491 describes pharmaceutical composition of amorphous vortioxetine hydrobromide and an adsorbent and the process to produce the same. WO2015044394 describes the process to' prepare pharmaceutical composition comprising 0.1 mg to 10 mg of vortioxetine hydrobromide wherein vortioxetine hydrobromide has PSD of D90 of less than 50|i.
WO2015044963 also published as US20160214949 describes amorphous vortioxetine hydrobromide, an amorphous solid dispersion of vortioxetine free base or salts, a process for the preparation of an amorphous solid dispersion of vortioxetine or salts thereof, an amorphous solid dispersion of vortioxetine hydrobromide substantially free from crystalline forms and residual solvents. In claim 22 and in claim 23 it claims an amorphous vortioxetine hydrobromide having particle size distributions, D(10) of about 50 (xm or less, D(50) of about 200 |im or less, and D(90) of about 400 \\m or less; or D(10) of about 25 |im or less, D(50) of about 100 (im or less, D(90) of about 250 jxm or less and a pharmaceutical composition comprising an amorphous vortioxetine hydrobromide having a particle size distributions, D(10) of about 50 |im or less, D(50) of about 200 \xm or less, D(90) of about 400 ^m or less; or D(10) of about 25 \im or less, D(50) of about 100 (im or less, D(90) of about 250 (im or less together with one or more of pharmaceutically acceptable carriers, excipients or diluents.
WO2016062860 in claim 1 claims a pharmaceutical composition comprising a solid solution or solid dispersion of amorphous vortioxetine hydrobromide in at least one
organic carrier, and at least one further ingredient being contained in an amount of
about 0.01 to about 80% by weight relative to the weight of the solid solution or solid
dispersion.
The solubility of vortioxetine hydrobromide salt in water is relatively poor. Increase in
crystal size or particle jeopardizes the solubility. As has been described in the prior
art, it is the particle size of the vortioxetine hydrobromide which is of critical
importance to produce desirable composition. Unique behavior of vortioxetine
hydrobromide, its vulnerability to undergo polymorphic change, and the critical nature
of crystal and their size impose severe limitations on use of vortioxetine hydrobromide
crystals which are of bigger size.
In view of the relatively poor solubility of vortioxetine, critical nature of crystal sizes
or particle size, there is a need to provide bioequivalent pharmaceutical compositions
containing vortioxetine hydrobromide that is different from the known particle sizes
used in the prior art. Thus the new particle size distribution is of critical importance
being novel and non-obvious. There is a need to prepare and provide stable,
reproducible and bioequivalent pharmaceutical compositions containing vortioxetine
hydrobromide of different particle size distribution.
It has now been unexpectedly found that pharmaceutical compositions containing
vortioxetine hydrobromide of different particle size distribution also produce similar
in-vitro and in-vivo profile as that of innovator composition.
It has been surprisingly found that even when PSD as prescribed by innovator in
US8722684 is not followed, it is possible to produce a stable, reproducible and
bioequivalent pharmaceutical compositions containing vortioxetine hydrobromide.
Another peculiarity of the prior art indicates that it is necessary to use wet granulation
techniques when vortioxetine hydrobromide of the PSD as prescribed and taught in
US8722684 is to be used. Wet granulation technique is of critical importance
according to US8722684 for the PSD taught by US8722684.
Surprisingly it is found that even when vortioxetine hydrobromide of different PSD is
used, still it is possible to produce stable, reproducible and bioequivalent
pharmaceutical compositions containing vortioxetine hydrobromide by wet
granulation technique.
More particularly it was a surprise to notice that when vortioxetine hydrobromide having PSD of D98 100-200^, D50 35-90|i and D5 7-30|i is used, the composition produced is stable, reproducible and bioequivalent.
OBJECT OF THE INVENTION
The main object of present invention is to provide vortioxetine hydrobromide having particle size distribution corresponding to D98 100-200|i, D50 35-90^ and D5 7-30\i. Another object of the invention is to provide a stable, reproducible and bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide and one or more pharmaceutically acceptable excipient.
Another object of the invention is to provide a stable, reproducible and bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide having PSD of D98 100-200|i, D50 35-90|i and D5 7-30|i and one or more pharmaceutically acceptable excipient.
Yet another object of present invention is to provide a stable, reproducible and bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide having PSD of D98 100-200|LI, D50 35-90|a and D5 7-30^i and one or more pharmaceutically acceptable excipient and which is produced by spray granulation, wet granulation.
SUMMARY OF THE INVENTION
The present invention relates to vortioxetine hydrobromide having particle size
distribution corresponding to D98 100-200|a, D50 35-90^ and D5 7-30|i.
The present invention relates to a stable, reproducible and bioequivalent
pharmaceutical composition comprising vortioxetine hydrobromide and one or more
pharmaceutically acceptable excipient.
The present invention particularly relates to a stable, reproducible and bioequivalent
pharmaceutical composition comprising vortioxetine hydrobromide having PSD of
D98 100-200^, D50 35-90^ and D5 7-30|i and one or more pharmaceutically
acceptable excipient.
Also the present invention particularly relates to a stable, reproducible and bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide having PSD of D98 100-200|i, D50 35-90|i and D5 7-30^i and one or more pharmaceutical^ acceptable excipient and which is produced by spray granulation, wet granulation.
DESCRIPTION OF THE DRAWINGS
Figure 1: Process flow chart for manufacturing of vortioxetine hydrobromide
tablets 5 mg, 10 mg, and 20 mg
Figure 2: Comparative dissolution profile of Trintellix® (Vortioxetine) tablets 5
mg and vortioxetine tablets 5 mg (Test)
Figure 3: Comparative dissolution profile of Trintellix® (Vortioxetine) tablets 10
mg and vortioxetine tablets 10 mg (Test)
Figure 4: Comparative dissolution profile of Trintellix® (Vortioxetine) tablets 20
mg and vortioxetine tablets 20 mg (Test)
Figure 5: Accelerated stability data of vortioxetine hydrobromide tablets 5 mg
Figure 6: Accelerated stability data of vortioxetine hydrobromide tablets 10 mg
Figure 7: Accelerated stability data of vortioxetine hydrobromide tablets 20 mg
DETAILED DESCRIPTION OF THE INVENTION
According to main object of the invention, there is provided vortioxetine
hydrobromide having Particle Size distribution corresponding to D98 100-200|i, D50
35-90|i and D5 7-30|i.
According to another object of the invention there is provided a stable, reproducible
and bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide
and one or more pharmaceutical^ acceptable excipient.
According to another object of the invention there is provided a stable, reproducible
and bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide
having PSD of D98 100-200^, D50 35-90|i and D5 7-30|i and one or more
pharmaceutical^ acceptable excipient.
According to yet another object, there is provided a stable, reproducible and
bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide
having PSD of D98 100-200|i, D50 35-90^ and D5 7-30\i and one or more
pharmaceutical^ acceptable excipient and which is produced by spray granulation,
wet granulation.
Terms "Vortioxetine Tablet(s)" and "Vortioxetine Hydrobromide Tablet(s)" are used
interchangeably and mean tablet(s) comprising vortioxetine hydrobromide as an active
ingredient.
The term "composition" as used herein refers to equivalents thereof, including but not
limited to cores, coated cores, pellets, micro-pellets, pills, compressed tablets,
granules, spheres, capsules and the like.
The term "pharmaceutically acceptable" as used herein means that which is useful in
preparing a pharmaceutical composition that is generally safe and non-toxic and
compatible with vortioxetine hydrobromide under test conditions.
The term "tablet" is intended to encompass compressed pharmaceutical dosage forms
of all shape and size, whether coated or uncoated.
The term "stable and reproducible" as used herein means that the composition is stable
when stored at stability conditions as per ICH stability guidelines and that the process
described produces a stable and bioequivalent formulation repeatedly.
The term "bioequivalent" as used herein means that a formulation that has the same
pharmacologic potency and bioavailability as that of reference formulation containing
same active agent at the same dose. Two products or formulations containing the same
active ingredient are bioequivalent if their rates and extents of absorption i.e.,
bioavailability are the same.
The term 'similarity factor' or ff2 factor' as used herein refers to one way of comparing
dissolution profiles of two different products. This model-independent mathematical
approach compares the dissolution profile of the two products: test and reference or
two strengths. Tests are recommended to be performed under the same test conditions.
The dissolution time points for both the profiles should be the same. An f2 value of 50
or greater (50-100) ensures sameness or equivalence of two curves, and thus
equivalent performance of the two products, in-vitro.
The term PSD as used herein means 'Particle Size Distribution'. The term RH as used herein means 'Relative Humidity'. The term ASTM as used herein means 'American Society for Testing and Materials'. The term |i as used herein means 'micron'. The term RPM as used herein means 'Revolutions per Minutes'. The term LOD as used herein means 'Loss on Drying.' The term "AUC" as used herein means area under the plasma drug concentration-time curve reflects the actual body exposure to drug after administration of a dose of the drug. The term "Cmax" as used herein means the maximum (or peak) serum concentration that a drug achieves in a specified compartment or test area of the body after the drug has been administrated and before the administration of a second dose. Vortioxetine hydrobromide is milled and or micronized to produce the vortioxetine hydrobromide having Particle Size distribution corresponding to D98 100-200|i, D50 35-90|i and D5 7-30^i. Particle size distribution is described herein, using quantiles, e.g. D5%, D50% and D98%. As used herein, "particle size distribution" means the cumulative volume size distribution of equivalent spherical diameters as determined by laser diffraction in Malvern Mastersizer 2000 equipment in wet method with liquid Paraffin. Novelty of the vortioxetine hydrobromide of the PSD D98 100-200^, D50 35-90|i and D5 7-3 0|i resides in the fact that it was not reported in the prior art that vortioxetine hydrobromide of D98 100-200|i, D50 35-90n and D5 7-30^ PSD produces bioequivalent pharmaceutical composition. Non-obviousness of the invention resides in the fact that in the light of prior art teachings, nobody would ever imagine that vortioxetine hydrobromide of D98 100-200|i, D50 35-90^ and D5 7-30^i PSD would ever produce bioequivalent pharmaceutical composition.
Prior art does teach wet granulation of vortioxetine hydrobromide. But it severely and categorically limits the use of wet granulation of vortioxetine hydrobromide of the PSD as prescribed in US US8722684.
Novelty and non-obviousness of the invention resides in the fact that prior art teachings neither teach nor do they ever support imagination that the process of wet granulation of vortioxetine hydrobromide of D98 100-200^, D50 35-90^ and D5 7-30fx PSD would produce bioequivalent pharmaceutical composition.
WO2015044963 also published as US20160214949 deals with amorphous
vortioxetine hydrobromide and does not anticipate present invention or does not
render present invention obvious.
The pharmaceutical composition of the present invention comprise one or more
pharmaceutically acceptable excipients which include, but are not limited to binders,
diluents, disintegrants, lubricants, glidants, coating agents, plasticizers, coloring agent,
viscosity enhancers, and the like and the combinations thereof.
Pharmaceutical ingredients such as corn starch, potato starch, talcum, magnesium
stearate, gelatin, lactose, gums, and the like and other adjuvants or additives such as
colouring agents, flavouring agents, preservatives etc, may be used provided that they
are compatible with vortioxetine hydrobromide under test conditions.
Diluents include, but are not limited to microcrystalline cellulose (MCC), microfine
cellulose, powdered cellulose, lactose, dibasic calcium phosphate, tribasic calcium
phosphate, starch, pre-gelatinized starch, calcium carbonate, calcium sulfate,
magnesium carbonate, magnesium oxide, dextrates, dextrin, dextrose, kaolin,
maltodextrin, mannitol, sucrose, methyl dextrin, sorbitol, the like and the
combinations thereof.
Binders include but are not limited to, polyvinylpyrrolidone (povidone, PVP),
polyethylene glycol (PEG), cross-linked polyvinylpyrrolidone, cellulose derivatives
(such as hydroxymethyl cellulose, hydroxypropylcellulose (HPC), carboxy-
methylcellulose sodium, ethyl cellulose, hydroxylethylcellose,
hydroxypropylmethylcellulose), sucrose, alginic acid or sodium alginate, carbomer,
cottonseed oil, dextrin, dextrose, guar gum, hydrogenated vegetable oil type I,
magnesium aluminium silicate, maltodextrin, maltose, polydextrose, polyethylene
oxide, stearic acid and zein and the combinations thereof.
Disintegrants include, but are not limited to carboxymethylcellulose calcium,
carboxymethylcellulose sodium, croscarmellose sodium, crospovidone, polacrilin
potassium, sodium alginate and sodium starch glycolate (SSG) and the combinations
thereof.
Lubricants according to the present invention include but are not limited to magnesium
stearate, aluminium stearate, sucrose stearate, stearic acid, talc, fumaric acid, palmitic
acid, sodium stearyl fumarate, glyceryl monostearate, carnauba wax, hydrogenated
vegetable oils, mineral oil, polyethylene glycols and the like and the combinations
thereof.
In one embodiment there is provided vortioxetine hydrobromide having Particle Size
distribution corresponding to D98 100-200ji, D50 35-90|i and D5 7-30fi. Vortioxetine
hydrobromide produced in bulk drug plant is milled and optionally micronized to
produce vortioxetine hydrobromide having particle size distribution corresponding to
D98 100-200fi, D50 35-90|a and D5 7-30|i. Conventionally used milling equipment is
used to produce vortioxetine hydrobromide of this PSD.
In one embodiment the present invention provides a stable, reproducible and
bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide.
In an embodiment the present invention provides a stable, reproducible and
bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide
having PSD of D98 100-200^, D50 35-90|i and D5 7-30ji.
In an embodiment the present invention provides a stable, reproducible and
bioequivalent pharmaceutical composition comprising vortioxetine hydrobromide
having PSD of D98 100-200^, D50 35-90^ and D5 7-30p, which is produced by wet
granulation.
After selecting relative % of the ingredients as per regulatory guidelines for lower
strengths, lower strengths which are similar to 20mg strength are developed.
The pharmaceutical composition comprising vortioxetine hydrobromide having PSD
of D98 100-200|i, D50 35-90jx and D5 7-30^ provides a stable and reproducible
formulation which shows similarity factor value of more than 50 when dissolution of
the formulation is compared with innovators product Trintellix 20 mg.
The pharmaceutical composition comprising vortioxetine hydrobromide having PSD
of D98 100-200ii, D50 35-90n and D5 7-30\i provides a stable and reproducible
formulation which shows similarity factor value of more than 50 when dissolution of
the formulation is compared with innovators product Trintellix lOmg.
The pharmaceutical composition comprising vortioxetine hydrobromide having PSD
of D98 100-200^, D50 35-90^ and D5 7-30jx provides a stable and reproducible

formulation which shows similarity factor value of more than 50 when dissolution of
the formulation is compared with innovators product Trintellix 5 mg.
When in-vivo testing and comparison is done, the composition of the present invention
shows similarity factor of more than 50 when compared with innovator product
Trintellix 20 mg. Cmax, AUC are depicted in the tables titled "Bioequivalence
Summary Table of Cmax" and "Bioequivalence Summary Table of AUCO-72"
The pharmaceutical composition of the invention may be present in the form of a
tablet, capsule, powder, disc, caplet, granules, pellets, tablet in tablet, tablet in capsule,
pellets in capsule, powder in capsule, granules in capsule and other dosage forms
suitable for oral administration. The tablets may further be coated with film forming
polymers.
The process to prepare pharmaceutical composition by wet granulation is provided.
The process comprises the steps of sifting and mixing of diluent/s binder and
disintegrant followed by granulating them with water and drying the granules,
followed by sizing of dried granules and blending them diluent and disintegrant,
followed by lubrication and compression.
In a preferred embodiment the pharmaceutical composition of the present invention is
prepared by wet granulation process, wherein the process comprised the steps of:
a. Dispensing all the ingredients as per formula and maintaining the
environmental conditions of the temperature and RH less than 25°C and RH
50% respectively.
b. Co-sifting vortioxetine hydrobromide of the PSD D98 100-200^, D50 35-90ji
and D5 7-30|a with mannitol, hydroxypropyl cellulose through mesh no.: # 40
ASTM twice.
c. Sifting microcrystalline cellulose and sodium starch glycolate through mesh
no.: #40 ASTM
d. Transferring Step (b) and (c) contents to Rapid Mixer Granulator (RMG) & dry
mix for 20 min at an impeller speed of 100 RPM (Slow).
e. Granulating the contents of step (d) in RMG with purified water using
peristaltic pump.

f. Drying the granules of step (e) in Fluid Bed Dryer (FBD) at 55 °C to obtain .
LODNMT4.0%
g. Sifting the dried granules of step (f) through mesh # 30 ASTM using
vibrosifter and collecting in a double-lined polyethylene bag.
h. Milling the retentions of step (g) through co-mill/multi-mill fitted with 1/1.5
mm screen. i. Sifting the milled granules of step (g) through mesh # 30 ASTM using
vibrosifter, mixing with step (f) granules and transferring into the blender. j. Sifting mannitol and sodium starch glycolate through mesh # 40 ASTM
using vibrosifter and adding to step (i) blender containing granules and mix
for lOmin at 16 rpm. k. Sift magnesium stearate through mesh # 60 ASTM using vibro-sifter and add
to step (j) blender containing granules and mixing for 3 min at 16 rpm. 1. Compressing the lubricated blend of step (k) with respective punches. m. Coating the compressed tablet with respective coating material as per unit
formula table to achieve the approximate weight gain 3%w/w.
Alternatively the procedure to be followed is as follows:
a. Sifting and mixing: Sifting vortioxetine hydrobromide of the PSD D98 100-
200|i5 D50 35-90^ and D5 7-30(i individually or with one or more of
microcrystalline cellulose, mannitol, HPC, SSG through #40 sieve and mix in
Rapid mix Granulator (RMG), to obtain pre-granulation blend.
b. Granulation: Granulate the pre-granulation blend obtained in step (a) with
purified water to obtain granules.
c. Drying and Sizing: Dry the granules obtained in step (b), in fluid bed dryer to
obtain the required LOD and size through #30 sieve to prepare sized granules.
d. Blending: Blend the sized granules obtained in step (c), with mannitol and SSG
at 16 RPM to obtain pre-lubrication blend.
e. Lubrication: Lubricate with pre-lubrication blend prepared in step (d), with
magnesium stearate at 16 RPM to obtain lubricated granules.

f. Compression: Compress the lubricated granules obtained in step (e) into tablets
by using 8.4 x 5.0mm almond shape punch.
g. Coating: Coat the compressed tablet prepared in Step (f), using Opadry
suspension to achieve required weight gain
The tablets may optionally be coated with a film coat, which provides different aesthetic appeal. Film coat also provides moisture protection, taste masking etc. Coating agents include, but not limited to polyvinyl alcohol, hydroxypropyl methylcellulose, carboxymethyl cellulose and like. Preferably coating is carried out using coating agents approved by Food Drugs and Administration (FDA) such as Opadry®.
EXAMPLES
The present invention is described in more detail by way of the following examples, but scope of the present invention is not limited thereto.
Vortioxetine hydrobromide is milled and optionally micronized to produce vortioxetine hydrobromide having particle size distribution corresponding to D98 100-200|i, D50 35-90|Li and D5 7-30|i. This vortioxetine hydrobromide having particle size distribution corresponding to D98 100-200ji, D50 35-90|i and D5 7-30)i is used in subsequent examples to prepare the pharmaceutical composition.
Example 1: The composition comprising vortioxetine hydrobromide of the PSD D98 100-200|a, D50 35-90n and D5 7-30|i.

Sr. Ingredients Grade Quantity/ Tablet (mg)

5 mg 10 mg 20 mg
A. Dry Mix
1 Vortioxetine Hydrobromide IH 6.36 12.71 25.42
2 Mannitol USP 25 50 50
3 Microcrystalline Cellulose USP/NF 27.9 55.79 43.08
4 Hydroxypropyl Cellulose NF 2.25 4.5 4.5
5 Sodium Starch Glycolate USP/NF 1.25 2.5 2.5

B. Granulating solution
6. Purified Water USP/Ph.Eur./ BP/IP q.s. q.s. q.s.
C. Extra granular
7. Mannitol USP 10.75 21.5 21.5
8. Sodium Starch Glycolate USP/NF 0.25 0.5 0.5
9. Magnesium Stearate USP/NF 1.25 2.5 2.5
Core Tablet Weight 75 150 150
D. Film Coating
10 Opadry Pink IH 2.55 - -

Opadry Yellow
- 4.5 -

Opadry Red
- - 4.5
11 Purified Water USP/Ph.Eur./ BP/IP q.s. q.s. q.s.
Coated Tahiti Weioht 77.25 154.5 154.5
Example 2: Process to prepare the tablet composition
a. Dispensed all the ingredients as per unit formula. Kept the temperature and RH
less than 25°C and RH 50% respectively.
b. Co-sifted API Vortioxetine Hydrobromide of the PSD D98 100-200|i, D50 35-
90\i and D5 7-30^ with Mannitol, HPC through mesh no.: # 40 ASTM twice.
c. Sifted MCC and SSG through mesh no.: # 40 ASTM
d. Transferred Step-2 and 3 contents to Rapid mixer granulator (RMG) & dry mix
for 20 min at an impeller speed of 100 RPM (Slow).
e. Granulated the contents of step (d) in RMG with purified water using
peristaltic pump.
f. Dried the granules of step (e) in Fluid Bed Dryer (FBD) at 55 °C to obtain
LOD NMT 4%
g. Sifted the dried granules of step (f) through mesh # 30 ASTM using
vibrosifter and collect in a double-lined polyethylene bag.
h. Milled the retentions of step (g) through co-mill/multi-mill 1/1.5 mm screen.

i. Sifted the milled granules of step (h) through mesh # 30 ASTM using
vibrosifter, mix with step (g) granules and transferred into the blender. j. Sifted Mannitol and Sodium Starch Glycolate through mesh # 40 ASTM
using vibrosifter and add to step (i) blender containing granules and mix for
lOmin at 16 rpm. k. Sifted Magnesium Stearate through mesh # 60 ASTM using vibro-sifter and
add to step (j) blender containing granules and mix for 3 min at 16 RPM. 1. Compressed the lubricated blend of step (k) with respective punches. m. Coated the compressed tablet with respective coating material as per unit
formula table to achieve the approximate weight gain 3.0%w/w.
Example 3: Process to prepare the tablet composition
a. Shifting and Mixing: Co-Sifted MCC, Mannitol, HPC, SSG and Vortioxetine
Hydrobromide having PSD of D98 100-200^ D50 35-90^ and D5 7-30^
through #40 sieve and mixed in RMG, to obtain pre-granulation blend.
b. Granulation: Granulated the pre-granulation blend obtained in step (a) with
Purified Water to obtain granules.
c. Drying and Sizing: Dried the granules obtained in step (b), in Fluid Bed dryer
to obtain the required LOD and sized through #30 sieve to prepare sized
granules.
d. Blending: Blended the sized granules obtained in step (c), with Mannitol and
SSG at 16 RPM to obtain pre-lubrication blend.
e. Lubrication: Lubricated with pre-lubrication blend prepared in step (d), with
Magnesium Stearate at 16 RPM to obtain lubricated granules.
f. Compression: Compressed the lubricated granules obtained in step (e) into
Tablets by using 8.4 x 5mm almond shape punch.
g. Coating: Coated the compressed tablet prepared in Step (f), using Opadry
suspension to achieve required weight gain

Example 4: Comparison of In-vitro dissolution profile of Vortioxetine Hydrobromide Tablets 5 mg, 10 mg and 20 mg.

1 rintelli 1 rintellix 1 rintellix
Time X® Vortioxe ® Vortioxe ® Vortioxe
points (Vortiox tine (Vortioxet tine (Vortioxet tine
Method (minut etine) tablets 5 ine) tablets ine) tablets
es) tablets 5mg mg tablets 10 mg 10 mg tablets 20 mg 20 mg
Paddle, 50 rpm, 900 ml, 0.1N HCl 5 89 89 85 83 77 82

10 96 97 93 99 94 97

15 97 98 95 101 99 100

30 98 97 96 101 102 101

45 98 97 97 101 102 100
F2val ue 93 .61 65.32 76.14
Example 5: In-vivo comparison of vortioxetine hydrobromide 20 mg Tablets prepared as per the invention, with Trintellix 20 mg.
Vortioxetine Hydrobromide tablets comprising Vortioxetine Hydrobromide of particle size distribution D98 100-200|i, D50 35-90|a and D5 7-30|a were prepared and were subjected to bioequivalence studies using Trintellix 20mg as reference composition. The findings are summarized in tables below: Bioequivalence Summary Table of Cmax:
Treatment Ratio 90%CI
Test product 20 mg 94.62 (86.89,103.04)
Innovator Product
Treatment Ratio 90%CI
Test product 20 mg 96.88 (88.12,106.51)
Innovator Product
Example 6: Stability data of vortioxetine tablets 5 mg, 10 mg and 20 mg
The stability data of vortioxetine tablets 5 mg, 10 mg and 20 mg obtained as per stability study performed at 40°C/75%RH are shown in Figure 5, Figure 6 and Figure 7 respectively.

We Claim:
1. A vortioxetine hydrobromide having particle size distribution corresponding to D98 100-200ji, D50 35-90^ and D5 7-30^.
2. A pharmaceutical composition comprising vortioxetine hydrobromide having particle size distribution of D98 100-200^, D50 35-90|i and D5 7-30^ and one or more pharmaceutical^ acceptable excipients.
3. A process to prepare a pharmaceutical composition comprising the steps of
a. Co-sifting vortioxetine hydrobromide having particle size distribution
of D98 100-200^, D50 35-90ji and D5 7-30^ with at least one more
ingredient selected from diluent or binder or disintegrant and mixing
them to obtain pre-granulation blend;
b. Granulating the pre-granulation blend obtained in step a. with purified
water to obtain granules;
c. Drying the granules obtained in step b. in fluid bed dryer and sizing
through suitable sieve to prepare sized granules;
d. Blending the sized granules obtained in step c. with other ingredients to
obtain pre-lubrication blend;
e. Lubricating the pre-lubrication blend prepared in step d. to obtain
lubricated granules;
f Compressing the lubricated granules obtained in step e. into tablets; g. Optionally coating the compressed tablets.
4. The composition according to claim 2, wherein the one or more pharmaceutically acceptable excipients are selected from binders, diluents, disintegrants, lubricants, glidants, coating agents, plasticizers, coloring agent, viscosity enhancers, and the like.
5. The composition according to claim 4 wherein diluent is selected from microcrystalline cellulose, microfine cellulose, mannitol, powdered cellulose, lactose, dibasic calcium phosphate, tribasic calcium phosphate, starch, pre-gelatinized starch, calcium carbonate, calcium sulfate, magnesium carbonate, magnesium oxide, dextrates, dextrin, dextrose, kaolin, maltodextrin, mannitol, sucrose, methyl dextrin and sorbitol and the combinations thereof.
6. The composition according to claim 4 wherein the binder is selected from polyvinylpyrrolidone (povidone, PVP), polyethylene glycol (PEG), cross-linked polyvinylpyrrolidone, cellulose derivatives (such as hydroxymethyl cellulose, hydroxypropylcellulose, carboxy- methylcellulose sodium, ethyl cellulose, hydroxylethylcellose, hydroxypropylmethylcellulose), sucrose, alginic acid or sodium alginate, carbomer, cottonseed oil, dextrin, dextrose, guar gum, hydrogenated vegetable oil type I, magnesium aluminium silicate, maltodextrin, maltose, polydextrose, polyethylene oxide, stearic acid and zein and the combinations thereof.
7. The composition according to claim 4 wherein the disintegrant is selected form carboxymethylcellulose calcium, carboxymethylcellulose sodium, croscarmellose sodium, crospovidone, polacrilin potassium, sodium alginate and sodium starch glycolate and the combinations thereof.
8. The composition according to claim 4 wherein the lubricant is selected from magnesium stearate, aluminium stearate, sucrose stearate, stearic acid, talc, fumaric acid, palmitic acid, sodium stearyl fumarate, glyceryl monostearate, carnauba wax, hydrogenated vegetable oils, mineral oil, polyethylene glycols and the like and the combinations thereof.
9. The composition according to claim 2, said composition being a tablet and comprising microcrystalline cellulose, mannitol, hydroxypropyl cellulose, sodium starch glycolate and magnesium stearate optionally coated.
10. The composition according to claim 9, said composition being a tablet prepared by wet granulation.