[0001] The present application claims the benefit of Indian Provisional Patent Application No. 201641044329 filed on 26-December-2016, the entire disclosure of which is relied on for all purposes and is incorporated into this application by reference.
FIELD OF THE INVENTION
[0002] This disclosure generally relates to compounds and compositions for the treatment of chronic pain. More particularly, this invention relates to treating subjects with a pharmaceutically acceptable dose of compounds, crystals, solvates, enantiomer, stereoisomer, esters, hydrates, or mixtures thereof.
BACKGROUND OF THE INVENTION
[0003] Chronic pain is a common medical condition afflicting up to 35% of the adult population (40% are female). Patients with co-existing chronic pain are prone to exacerbation of their underlying pain condition following surgery. Both pre-existing pain and elevated analgesic requirements continue to be significant predictors of severe postoperative pain development. Specific approaches toward perioperative management of patients with co-existing chronic pain are not adequately described in the scope of current chronic and acute pain management guidelines worldwide
[0004] Epidural analgesia provides significant acute pain benefits in the early perioperative period, especially for major abdominal and thoracic surgery, and several large studies have demonstrated these benefits. However, the ability to prevent progression to chronicity has been less effective, with mixed results across several studies.

[0005] Good perioperative analgesia and minimization of surgical tissue injury will remain important goals for both anesthesiologist and surgeon in the perioperative period. The broader and more consistent use of multimodal analgesic techniques remain the simplest current method by which anesthesiologists could have a major impact on the development of chronic post-surgical pain.
[0006] The mechanisms of postoperative chronic pain are complex and not fully understood. Different mechanisms are responsible for different pain syndromes, even in one type of surgery. The surgical stimulus and tissue trauma that results from incision cause postoperative inflammatory reaction which only terminates with the final healing process; thus, facilitating the process of neuroplasticity and consequent changes in neuronal membrane excitability.
[0007] Furthermore, there is a possible reduction of the central inhibitory mechanisms and increased excitatory synaptic efficacy. Neuroplasticity can be divided into two interconnected types: peripheral and central. Peripheral neuroplasticity occurs from the release of inflammatory mediators (cytokines, prostaglandins, bradykinin, histamine, serotonin, H+ ions) by damaged tissues or inflammatory cells, with activation of intracellular cascades that culminate in reducing the excitatory threshold and may cause pain perception with a reduced stimulus (allodynia) or increased response to aggressive stimulus (hyperalgesia).
[0008] Persistent postoperative chronic pain is a complex entity whose etiology is not fully elucidated, which affects the quality of life of individuals. Neuropathic pain resulting from surgical trauma is still the most common expression of this entity. For its prevention, appropriate perioperative analgesia is essential and techniques that avoid nerve damage are recommended and should be used whenever possible.
[0009] Managing acute pathology of often relies on the addressing underlying pathology and symptoms of the disease. There is currently a need in the art for new compositions to treatment or delay of the onset of chronic pain and its associated complications progression.

[0010] The present invention provides compounds, compositions containing these compounds and methods for using the same to treat, prevent and/or ameliorate the effects of the conditions such as chronic pain.
[0011] The invention herein provides compositions comprising of formula I or pharmaceutical acceptable hydrates or solvates thereof. The invention also provides pharmaceutical compositions comprising one or more compounds of formula I or intermediates thereof and one or more of pharmaceutically acceptable carriers, vehicles or diluents. These compositions may be used in the treatment of chronic pain and its associated complications.

Formula I and pharmaceutically acceptable hydrates, solvates, enantiomers, and stereoisomers thereof;
[0012] Wherein,
RH independently represents
caprylic acid, 1-hydroxy-2-naphthoic acid, 2,2-dichloroacetic acid, 2-hydroxyethanesulfonic acid, 2-oxoglutaric acid, 4-acetamidobenzoic acid, 4-aminosalicylic acid, acetic acid, adipic acid, ascorbic acid, aspartic acid, benzenesulfonic acid, benzoic acid, camphoric acid, camphor-10-sulfonic acid, capric acid (decanoic acid), caproic acid (hexanoic acid), carbonic acid, cinnamic acid, citric acid, cyclamic acid, dodecylsulfuric acid, ethane-1,2-disulfonic acid,

ethanesulfonic acid, formic acid, fumaric acid, galactaric acid, gentisic acid, glucoheptonic acid, gluconic acid , glucuronic acid, glutamic acid, glutaric acid, glycerophosphoric acid, glycolic acid, hippuric acid, hydrobromic acid, isobutyric acid, lactic acid, lactobionic acid, lauric acid, maleic acid, malic acid, malonic acid, mandelic acid, methanesulfonic acid, naphthalene-1,5-disulfonic acid, naphthalene-2-sulfonic acid, nicotinic acid, nitric acid, oleic acid, oxalic acid, palmitic acid, pamoic acid, phosphoric acid, proprionic acid, pyroglutamic acid, salicylic acid, sebacic acid, stearic acid, succinic acid, sulfuric acid, tartaric acid, thiocyanic acid, toluenesulfonic acid, undecylenic acid, omega 3 fatty acids, omega 6 fatty acids, n-acetyl cysteine (nac), furoate, methyl furoate, ethyl furoate, aminocaproic acid, caproic acid, caprilic acid, capric acid, lauric acid, alpha lipoic acid, R-lipoic acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, phospholipids, phosphatidylcholine, oleic acid, elaidic acid, linoleic acid, linolenic acid, menthol, retinoic acid, vitamin A, retinol, linolelaidic acid, arachidonic acid, phospholipids, phosphatidylcholine, menthol, retinoic acid, vitamin a, retinol, retinal, isotretinoin, curcumin, tretinoin, a-carotene P-carotene retinol, d2 ergosterol, ergocalciferol, 7-dehydrocholesterol, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), calcitroic acid, d4 dihydroergocalciferol, alfacalcidol, dihydrotachysterol, calcipotriol, tacalcitol, paricalcitol, tocopherol, naphthoquinone, phylloquinone (kl), menaquinones (k2), menadione (k3), menadiol (k4), thiamine, acefurtiamine, allithiamine, benfotiamine, fursultiamine, octotiamine, prosultiamine, sulbutiamine, riboflavin, niacin, nicotinamide, pantothenic acid, dexpanthenol, pantethine, pyridoxine, pyridoxal phosphate, pyridoxamine, pyritinol, biotin, folic acid, dihydrofolic acid, folinic acid, levomefolic acid, adenosylcobalamin, cyanocobalamin, hydroxocobalamin, methylcobalamin, choline, ascorbic acid, dehydroascorbic acid, 1-docosanol or

depending on the pH of the environment, the composition may be in the form of a mixture of cinchocaine/dibucaine and acid components [RH]. The invention also provides pharmaceutical compositions comprising compositions of formula I and pharmaceutically acceptable excipients.
[0014] In certain embodiments, the compounds of formula II are described:
and pharmaceutically acceptable hydrates, solvates, enantiomers, and stereoisomers thereof;
[0015] Wherein,
RH independently represents
caprylic acid, 1-hydroxy-2-naphthoic acid, 2,2-dichloroacetic acid, 2-hydroxyethanesulfonic acid, 2-oxoglutaric acid, 4-acetamidobenzoic acid, 4-aminosalicylic acid, acetic acid, adipic acid, ascorbic acid, aspartic acid, benzenesulfonic acid, benzoic acid, camphoric acid, camphor-10-sulfonic acid, capric acid (decanoic acid), caproic acid (hexanoic acid), carbonic acid, cinnamic acid, citric acid, cyclamic acid, dodecylsulfuric acid, ethane-1,2-disulfonic acid, ethanesulfonic acid, formic acid, fumaric acid, galactaric acid, gentisic acid, glucoheptonic acid, gluconic acid , glucuronic acid, glutamic acid, glutaric acid, glycerophosphoric acid, glycolic acid, hippuric acid, hydrobromic acid, isobutyric acid, lactic acid, lactobionic acid, lauric acid, maleic acid, malic acid, malonic acid, mandelic acid, methanesulfonic acid, naphthalene-1,5-disulfonic acid, naphthalene-2-sulfonic acid, nicotinic acid, nitric acid, oleic acid, oxalic acid,

palmitic acid, pamoic acid, phosphoric acid, proprionic acid, pyroglutamic acid, salicylic acid, sebacic acid, stearic acid, succinic acid, sulfuric acid, tartaric acid, thiocyanic acid, toluenesulfonic acid, undecylenic acid, omega 3 fatty acids, omega 6 fatty acids, n-acetyl cysteine (nac), furoate, methyl furoate, ethyl furoate, aminocaproic acid, caproic acid, caprilic acid, capric acid, lauric acid, alpha lipoic acid, R-lipoic acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, phospholipids, phosphatidylcholine, oleic acid, elaidic acid, linoleic acid, linolenic acid, menthol, retinoic acid, vitamin A, retinol, linolelaidic acid, arachidonic acid, phospholipids, phosphatidylcholine, menthol, retinoic acid, vitamin a, retinol, retinal, isotretinoin, curcumin, tretinoin, a-carotene P-carotene retinol, d2 ergosterol, ergocalciferol, 7-dehydrocholesterol, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), calcitroic acid, d4 dihydroergocalciferol, alfacalcidol, dihydrotachysterol, calcipotriol, tacalcitol, paricalcitol, tocopherol, naphthoquinone, phylloquinone (kl), menaquinones (k2), menadione (k3), menadiol (k4), thiamine, acefurtiamine, allithiamine, benfotiamine, fursultiamine, octotiamine, prosultiamine, sulbutiamine, riboflavin, niacin, nicotinamide, pantothenic acid, dexpanthenol, pantethine, pyridoxine, pyridoxal phosphate, pyridoxamine, pyritinol, biotin, folic acid, dihydrofolic acid, folinic acid, levomefolic acid, adenosylcobalamin, cyanocobalamin, hydroxocobalamin, methylcobalamin, choline, ascorbic acid, dehydroascorbic acid, 1-docosanol or

[0016] The compositions are typically compounds in the forms of hydrates or solvates of articaine and an acidic moiety [RH] containing compound selected [RH] in which the articaine is protonated and the acid moiety [RH] of the pharmaceutically acceptable salt is at least in partially ionic form. In some instances, however, for example depending on the pH of the environment, the composition may be in the form of a mixture of articaine and acid components [RH]. The invention also provides pharmaceutical compositions comprising compositions of formula II and pharmaceutically acceptable excipients.

i uniiuia 111
and pharmaceutically acceptable hydrates, solvates, prodrugs, enantiomers, and stereoisomers thereof;
[0018] Wherein,
RH independently represents
caprylic acid, 1-hydroxy-2-naphthoic acid, 2,2-dichloroacetic acid, 2-hydroxyethanesulfonic acid, 2-oxoglutaric acid, 4-acetamidobenzoic acid, 4-aminosalicylic acid, acetic acid, adipic acid, ascorbic acid, aspartic acid, benzenesulfonic acid, benzoic acid, camphoric acid, camphor-10-sulfonic acid, capric acid (decanoic acid), caproic acid (hexanoic acid), carbonic acid, cinnamic acid, citric acid, cyclamic acid, dodecylsulfuric acid, ethane-1,2-disulfonic acid, ethanesulfonic acid, formic acid, fumaric acid, galactaric acid, gentisic acid, glucoheptonic acid, gluconic acid , glucuronic acid, glutamic acid, glutaric acid, glycerophosphoric acid, glycolic acid, hippuric acid, hydrobromic acid, isobutyric acid, lactic acid, lactobionic acid, lauric acid, maleic acid, malic acid, malonic acid, mandelic acid, methanesulfonic acid, naphthalene-1,5-disulfonic acid, naphthalene-2-sulfonic acid, nicotinic acid, nitric acid, oleic acid, oxalic acid, palmitic acid, pamoic acid, phosphoric acid, proprionic acid, pyroglutamic acid, salicylic acid, sebacic acid, stearic acid, succinic acid, sulfuric acid, tartaric acid, thiocyanic acid, toluenesulfonic acid, undecylenic acid, omega 3 fatty acids, omega 6 fatty acids, n-acetyl cysteine (nac), furoate, methyl furoate, ethyl furoate, aminocaproic acid, caproic acid, caprilic acid, capric acid, lauric acid, alpha lipoic acid, R-lipoic acid, myristic acid, myristoleic acid,

palmitic acid, palmitoleic acid, phospholipids, phosphatidylcholine, oleic acid, elaidic acid, linoleic acid, linolenic acid, menthol, retinoic acid, vitamin A, retinol, linolelaidic acid, arachidonic acid, phospholipids, phosphatidylcholine, menthol, retinoic acid, vitamin a, retinol, retinal, isotretinoin, curcumin, tretinoin, a-carotene P-carotene retinol, d2 ergosterol, ergocalciferol, 7-dehydrocholesterol, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), calcitroic acid, d4 dihydroergocalciferol, alfacalcidol, dihydrotachysterol, calcipotriol, tacalcitol, paricalcitol, tocopherol, naphthoquinone, phylloquinone (kl), menaquinones (k2), menadione (k3), menadiol (k4), thiamine, acefurtiamine, allithiamine, benfotiamine, fursultiamine, octotiamine, prosultiamine, sulbutiamine, riboflavin, niacin, nicotinamide, pantothenic acid, dexpanthenol, pantethine, pyridoxine, pyridoxal phosphate, pyridoxamine, pyritinol, biotin, folic acid, dihydrofolic acid, folinic acid, levomefolic acid, adenosylcobalamin, cyanocobalamin, hydroxocobalamin, methylcobalamin, choline, ascorbic acid, dehydroascorbic acid, 1-docosanol or

[0019] The compositions are typically compounds in the forms of hydrates or solvates of etidocaine and an acidic moiety [RH] containing compound selected [RH] in which the etidocaine is protonated and the acid moiety [RH] of the pharmaceutically acceptable salt is at least in partially ionic form. In some instances, however, for example depending on the pH of the environment, the composition may be in the form of a mixture of etidocaine and acid components [RH]. The invention also provides pharmaceutical compositions comprising compositions of formula III and pharmaceutically acceptable excipients.
[0020] In certain embodiments, the compounds of formula IV are described:

Formula IV and pharmaceutically acceptable hydrates, solvates, prodrugs, enantiomers, and stereoisomers thereof;
[0021] Wherein,
RH independently represents
caprylic acid, 1-hydroxy-2-naphthoic acid, 2,2-dichloroacetic acid, 2-hydroxyethanesulfonic acid, 2-oxoglutaric acid, 4-acetamidobenzoic acid, 4-aminosalicylic acid, acetic acid, adipic acid, ascorbic acid, aspartic acid, benzenesulfonic acid, benzoic acid, camphoric acid, camphor-10-sulfonic acid, capric acid (decanoic acid), caproic acid (hexanoic acid), carbonic acid, cinnamic acid, citric acid, cyclamic acid, dodecylsulfuric acid, ethane-1,2-disulfonic acid, ethanesulfonic acid, formic acid, fumaric acid, galactaric acid, gentisic acid, glucoheptonic acid, gluconic acid , glucuronic acid, glutamic acid, glutaric acid, glycerophosphoric acid, glycolic acid, hippuric acid, hydrobromic acid, isobutyric acid, lactic acid, lactobionic acid, lauric acid, maleic acid, malic acid, malonic acid, mandelic acid, methanesulfonic acid, naphthalene-1,5-disulfonic acid, naphthalene-2-sulfonic acid, nicotinic acid, nitric acid, oleic acid, oxalic acid, palmitic acid, pamoic acid, phosphoric acid, proprionic acid, pyroglutamic acid, salicylic acid, sebacic acid, stearic acid, succinic acid, sulfuric acid, tartaric acid, thiocyanic acid,

toluenesulfonic acid, undecylenic acid, omega 3 fatty acids, omega 6 fatty acids, n-acetyl cysteine (nac), furoate, methyl furoate, ethyl furoate, aminocaproic acid, caproic acid, caprilic acid, capric acid, lauric acid, alpha lipoic acid, R-lipoic acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, phospholipids, phosphatidylcholine, oleic acid, elaidic acid, linoleic acid, linolenic acid, menthol, retinoic acid, vitamin A, retinol, linolelaidic acid, arachidonic acid, phospholipids, phosphatidylcholine, menthol, retinoic acid, vitamin a, retinol, retinal, isotretinoin, curcumin, tretinoin, a-carotene P-carotene retinol, d2 ergosterol, ergocalciferol, 7-dehydrocholesterol, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), calcitroic acid, d4 dihydroergocalciferol, alfacalcidol, dihydrotachysterol, calcipotriol, tacalcitol, paricalcitol, tocopherol, naphthoquinone, phylloquinone (kl), menaquinones (k2), menadione (k3), menadiol (k4), thiamine, acefurtiamine, allithiamine, benfotiamine, fursultiamine, octotiamine, prosultiamine, sulbutiamine, riboflavin, niacin, nicotinamide, pantothenic acid, dexpanthenol, pantethine, pyridoxine, pyridoxal phosphate, pyridoxamine, pyritinol, biotin, folic acid, dihydrofolic acid, folinic acid, levomefolic acid, adenosylcobalamin, cyanocobalamin, hydroxocobalamin, methylcobalamin, choline, ascorbic acid, dehydroascorbic acid, 1-docosanol or

[0022] The compositions are typically compounds in the forms of hydrates or solvates of levobupivacaine and an acidic moiety [RH] containing compound selected [RH] in which the levobupivacaine is protonated and the acid moiety [RH] of the pharmaceutically acceptable salt is at least in partially ionic form. In some instances, however, for example depending on the pH of the environment, the composition may be in the form of a mixture of levobupivacaine and acid components [RH]. The invention also provides pharmaceutical compositions comprising compositions of formula IV and pharmaceutically acceptable excipients.

RH independently represents
phospholipids, phosphatidylcholine, menthol, retinoic acid, vitamin A, retinol, retinal, isotretinoin, curcumin, tretinoin, a-carotene P-carotene retinol, 62 ergosterol, ergocalciferol, 7-dehydrocholesterol, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), calcitroic acid, d4 dihydroergocalciferol, alfacalcidol, dihydrotachysterol, calcipotriol, tacalcitol, paricalcitol, tocopherol, naphthoquinone, phylloquinone (kl), menaquinones (k2), menadione (k3), menadiol (k4), thiamine, acefurtiamine, allithiamine, benfotiamine, fursultiamine, octotiamine, prosultiamine, sulbutiamine, riboflavin, niacin, nicotinamide, pantothenic acid, dexpanthenol, pantethine, pyridoxine, pyridoxal phosphate, pyridoxamine, pyritinol, biotin, folic acid, dihydrofolic acid, folinic acid, levomefolic acid, adenosylcobalamin, cyanocobalamin, hydroxocobalamin, methylcobalamin, choline, ascorbic acid, dehydroascorbic acid, 1-docosanol or

[0025] The compositions are typically compounds in the forms of hydrates or solvates of lidocaine and an acidic moiety [RH] containing compound selected [RH] in which the lidocaine is protonated and the acid moiety [RH] of the pharmaceutically acceptable salt is at least in partially ionic form. In some instances, however, for example depending on the pH of the environment, the composition may be in the form of a mixture of lidocaine and acid components [RH]. The invention also provides pharmaceutical compositions comprising compositions of formula V and pharmaceutically acceptable excipients.
[0026] In certain embodiments, the compounds of formula VI are described:
and pharmaceutically acceptable hydrates, solvates, prodrugs, enantiomers, and stereoisomers thereof;
[0027] Wherein,
RH independently represents
phospholipids, phosphatidylcholine, menthol, retinoic acid, vitamin A, retinol, retinal, isotretinoin, curcumin, tretinoin, a-carotene [3-carotene retinol, 62 ergosterol, ergocalciferol, 7-dehydrocholesterol, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), calcitroic acid, d4 dihydroergocalciferol, alfacalcidol,

dihydrotachysterol, calcipotriol, tacalcitol, paricalcitol, tocopherol, naphthoquinone, phylloquinone (kl), menaquinones (k2), menadione (k3), menadiol (k4), thiamine, acefurtiamine, allithiamine, benfotiamine, fursultiamine, octotiamine, prosultiamine, sulbutiamine, riboflavin, niacin, nicotinamide, pantothenic acid, dexpanthenol, pantethine, pyridoxine, pyridoxal phosphate, pyridoxamine, pyritinol, biotin, folic acid, dihydrofolic acid, folinic acid, levomefolic acid, adenosylcobalamin, cyanocobalamin, hydroxocobalamin, methylcobalamin, choline, ascorbic acid, dehydroascorbic acid, 1-docosanol or

[0028] The compositions are typically compounds in the forms of hydrates or solvates of bupivacaine and an acidic moiety [RH] containing compound selected [RH] in which the bupivacaine is protonated and the acid moiety [RH] of the pharmaceutically acceptable salt is at least in partially ionic form. In some instances, however, for example depending on the pH of the environment, the composition may be in the form of a mixture of bupivacaine and acid components [RH]. The invention also provides pharmaceutical compositions comprising compositions of formula VI and pharmaceutically acceptable excipients.
[0029] In certain embodiments, the compounds of formula VII are described:
and pharmaceutically acceptable hydrates, solvates, prodrugs, enantiomers, and stereoisomers thereof; [0030] Wherein,
RH independently represents
caprylic acid, 1-hydroxy-2-naphthoic acid, 2,2-dichloroacetic acid, 2-hydroxyethanesulfonic
acid, 2-oxoglutaric acid, 4-acetamidobenzoic acid, 4-aminosalicylic acid, acetic acid, adipic

acid, ascorbic acid, aspartic acid, benzenesulfonic acid, benzoic acid, camphoric acid, camphor-10-sulfonic acid, capric acid (decanoic acid), caproic acid (hexanoic acid), carbonic acid, cinnamic acid, citric acid, cyclamic acid, dodecylsulfuric acid, ethane-1,2-disulfonic acid, ethanesulfonic acid, formic acid, fumaric acid, galactaric acid, gentisic acid, glucoheptonic acid, gluconic acid , glucuronic acid, glutamic acid, glutaric acid, glycerophosphoric acid, glycolic acid, hippuric acid, hydrobromic acid, isobutyric acid, lactic acid, lactobionic acid, lauric acid, maleic acid, malic acid, malonic acid, mandelic acid, methanesulfonic acid, naphthalene-1,5-disulfonic acid, naphthalene-2-sulfonic acid, nicotinic acid, nitric acid, oleic acid, oxalic acid, palmitic acid, pamoic acid, phosphoric acid, proprionic acid, pyroglutamic acid, salicylic acid, sebacic acid, stearic acid, succinic acid, sulfuric acid, tartaric acid, thiocyanic acid, toluenesulfonic acid, undecylenic acid, omega 3 fatty acids, omega 6 fatty acids, n-acetyl cysteine (nac), furoate, methyl furoate, ethyl furoate, aminocaproic acid, caproic acid, caprilic acid, capric acid, lauric acid, alpha lipoic acid, R-lipoic acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, phospholipids, phosphatidylcholine, oleic acid, elaidic acid, linoleic acid, linolenic acid, menthol, retinoic acid, vitamin A, retinol, linolelaidic acid, arachidonic acid, phospholipids, phosphatidylcholine, menthol, retinoic acid, vitamin a, retinol, retinal, isotretinoin, curcumin, tretinoin, a-carotene P-carotene retinol, d2 ergosterol, ergocalciferol, 7-dehydrocholesterol, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), calcitroic acid, d4 dihydroergocalciferol, alfacalcidol, dihydrotachysterol, calcipotriol, tacalcitol, paricalcitol, tocopherol, naphthoquinone, phylloquinone (kl), menaquinones (k2), menadione (k3), menadiol (k4), thiamine, acefurtiamine, allithiamine, benfotiamine, fursultiamine, octotiamine, prosultiamine, sulbutiamine, riboflavin, niacin, nicotinamide, pantothenic acid, dexpanthenol, pantethine, pyridoxine, pyridoxal phosphate, pyridoxamine, pyritinol, biotin, folic acid, dihydrofolic acid, folinic acid, levomefolic acid, adenosylcobalamin, cyanocobalamin, hydroxocobalamin, methylcobalamin, choline, ascorbic acid, dehydroascorbic acid, , 1-docosanol or

least in partially ionic form. In some instances, however, for example depending on the pH of the environment, the composition may be in the form of a mixture of mepivacaine and acid components [RH]. The invention also provides pharmaceutical compositions comprising compositions of formula VII and pharmaceutical^ acceptable excipients.
[0032] In the Formula VII, mepivacaine might consists of R(-)-mepivacaine and S(+)-mepivacaine in equal proportions and one of the enantiomer could be selected for the salt preparation process or the racemic mixture containing equal propositions of R and S enantiomers can be selected for the salt preparation process.
[0033] In certain embodiments, the compounds of formula VIII are described:
and pharmaceutically acceptable hydrates, solvates, prodrugs, enantiomers, and stereoisomers thereof;
[0034] Wherein,
RH independently represents
caprylic acid, 1-hydroxy-2-naphthoic acid, 2,2-dichloroacetic acid, 2-hydroxyethanesulfonic acid, 2-oxoglutaric acid, 4-acetamidobenzoic acid, 4-aminosalicylic acid, acetic acid, adipic acid, ascorbic acid, aspartic acid, benzenesulfonic acid, benzoic acid, camphoric acid, camphor-

10-sulfonic acid, capric acid (decanoic acid), caproic acid (hexanoic acid), carbonic acid, cinnamic acid, citric acid, cyclamic acid, dodecylsulfuric acid, ethane-1,2-disulfonic acid, ethanesulfonic acid, formic acid, fumaric acid, galactaric acid, gentisic acid, glucoheptonic acid, gluconic acid , glucuronic acid, glutamic acid, glutaric acid, glycerophosphoric acid, glycolic acid, hippuric acid, hydrobromic acid, isobutyric acid, lactic acid, lactobionic acid, lauric acid, maleic acid, malic acid, malonic acid, mandelic acid, methanesulfonic acid, naphthalene-1,5-disulfonic acid, naphthalene-2-sulfonic acid, nicotinic acid, nitric acid, oleic acid, oxalic acid, palmitic acid, pamoic acid, phosphoric acid, proprionic acid, pyroglutamic acid, salicylic acid, sebacic acid, stearic acid, succinic acid, sulfuric acid, tartaric acid, thiocyanic acid, toluenesulfonic acid, undecylenic acid, omega 3 fatty acids, omega 6 fatty acids, n-acetyl cysteine (nac), furoate, methyl furoate, ethyl furoate, aminocaproic acid, caproic acid, caprilic acid, capric acid, lauric acid, alpha lipoic acid, R-lipoic acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, phospholipids, phosphatidylcholine, oleic acid, elaidic acid, linoleic acid, linolenic acid, menthol, retinoic acid, vitamin A, retinol, linolelaidic acid, arachidonic acid, phospholipids, phosphatidylcholine, menthol, retinoic acid, vitamin a, retinol, retinal, isotretinoin, curcumin, tretinoin, a-carotene P-carotene retinol, d2 ergosterol, ergocalciferol, 7-dehydrocholesterol, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), calcitroic acid, d4 dihydroergocalciferol, alfacalcidol, dihydrotachysterol, calcipotriol, tacalcitol, paricalcitol, tocopherol, naphthoquinone, phylloquinone (kl), menaquinones (k2), menadione (k3), menadiol (k4), thiamine, acefurtiamine, allithiamine, benfotiamine, fursultiamine, octotiamine, prosultiamine, sulbutiamine, riboflavin, niacin, nicotinamide, pantothenic acid, dexpanthenol, pantethine, pyridoxine, pyridoxal phosphate, pyridoxamine, pyritinol, biotin, folic acid, dihydrofolic acid, folinic acid, levomefolic acid, adenosylcobalamin, cyanocobalamin, hydroxocobalamin, methylcobalamin, choline, ascorbic acid, dehydroascorbic acid, , 1-docosanol or

least in partially ionic form. In some instances, however, for example depending on the pH of the environment, the composition may be in the form of a mixture of ropivacaine and acid components [RH]. The invention also provides pharmaceutical compositions comprising compositions of formula VIII and pharmaceutical^ acceptable excipients.
and pharmaceutically acceptable hydrates, solvates, prodrugs, enantiomers, and stereoisomers thereof;
[0037] Wherein,
RH independently represents
caprylic acid, 1-hydroxy-2-naphthoic acid, 2,2-dichloroacetic acid, 2-hydroxyethanesulfonic acid, 2-oxoglutaric acid, 4-acetamidobenzoic acid, 4-aminosalicylic acid, acetic acid, adipic acid, ascorbic acid, aspartic acid, benzenesulfonic acid, benzoic acid, camphoric acid, camphor-10-sulfonic acid, capric acid (decanoic acid), caproic acid (hexanoic acid), carbonic acid, cinnamic acid, citric acid, cyclamic acid, dodecylsulfuric acid, ethane-1,2-disulfonic acid, ethanesulfonic acid, formic acid, fumaric acid, galactaric acid, gentisic acid, glucoheptonic acid, gluconic acid , glucuronic acid, glutamic acid, glutaric acid, glycerophosphoric acid, glycolic acid, hippuric acid, hydrobromic acid, isobutyric acid, lactic acid, lactobionic acid, lauric acid,

maleic acid, malic acid, malonic acid, mandelic acid, methanesulfonic acid, naphthalene-1,5-disulfonic acid, naphthalene-2-sulfonic acid, nicotinic acid, nitric acid, oleic acid, oxalic acid, palmitic acid, pamoic acid, phosphoric acid, proprionic acid, pyroglutamic acid, salicylic acid, sebacic acid, stearic acid, succinic acid, sulfuric acid, tartaric acid, thiocyanic acid, toluenesulfonic acid, undecylenic acid, omega 3 fatty acids, omega 6 fatty acids, n-acetyl cysteine (nac), furoate, methyl furoate, ethyl furoate, aminocaproic acid, caproic acid, caprilic acid, capric acid, lauric acid, alpha lipoic acid, R-lipoic acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, phospholipids, phosphatidylcholine, oleic acid, elaidic acid, linoleic acid, linolenic acid, menthol, retinoic acid, vitamin A, retinol, linolelaidic acid, arachidonic acid, phospholipids, phosphatidylcholine, menthol, retinoic acid, vitamin a, retinol, retinal, isotretinoin, curcumin, tretinoin, a-carotene P-carotene retinol, d2 ergosterol, ergocalciferol, 7-dehydrocholesterol, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), calcitroic acid, d4 dihydroergocalciferol, alfacalcidol, dihydrotachysterol, calcipotriol, tacalcitol, paricalcitol, tocopherol, naphthoquinone, phylloquinone (kl), menaquinones (k2), menadione (k3), menadiol (k4), thiamine, acefurtiamine, allithiamine, benfotiamine, fursultiamine, octotiamine, prosultiamine, sulbutiamine, riboflavin, niacin, nicotinamide, pantothenic acid, dexpanthenol, pantethine, pyridoxine, pyridoxal phosphate, pyridoxamine, pyritinol, biotin, folic acid, dihydrofolic acid, folinic acid, levomefolic acid, adenosylcobalamin, cyanocobalamin, hydroxocobalamin, methylcobalamin, choline, ascorbic acid, dehydroascorbic acid, 1-docosanol or

[0038] The compositions are typically compounds in the forms of hydrates or solvates of tetracaine and an acidic moiety [RH] containing compound selected [RH] in which the tetracaine is protonated and the acid moiety [RH] of the pharmaceutically acceptable salt is at least in partially ionic form. In some instances, however, for example depending on the pH of the environment, the composition may be in the form of a mixture of tetracaine and acid components [RH]. The invention also provides pharmaceutical compositions comprising compositions of formula IX and pharmaceutically acceptable excipients.

and pharmaceutically acceptable hydrates, solvates, prodrugs, enantiomers, and stereoisomers thereof;
[0040] Wherein,
RH independently represents
caprylic acid, 1-hydroxy-2-naphthoic acid, 2,2-dichloroacetic acid, 2-hydroxyethanesulfonic acid, 2-oxoglutaric acid, 4-acetamidobenzoic acid, 4-aminosalicylic acid, acetic acid, adipic acid, ascorbic acid, aspartic acid, benzenesulfonic acid, benzoic acid, camphoric acid, camphor-10-sulfonic acid, capric acid (decanoic acid), caproic acid (hexanoic acid), carbonic acid, cinnamic acid, citric acid, cyclamic acid, dodecylsulfuric acid, ethane-1,2-disulfonic acid, ethanesulfonic acid, formic acid, fumaric acid, galactaric acid, gentisic acid, glucoheptonic acid, gluconic acid , glucuronic acid, glutamic acid, glutaric acid, glycerophosphoric acid, glycolic acid, hippuric acid, hydrobromic acid, isobutyric acid, lactic acid, lactobionic acid, lauric acid, maleic acid, malic acid, malonic acid, mandelic acid, methanesulfonic acid, naphthalene-1,5-disulfonic acid, naphthalene-2-sulfonic acid, nicotinic acid, nitric acid, oleic acid, oxalic acid, palmitic acid, pamoic acid, phosphoric acid, proprionic acid, pyroglutamic acid, salicylic acid, sebacic acid, stearic acid, succinic acid, sulfuric acid, tartaric acid, thiocyanic acid, toluenesulfonic acid, undecylenic acid, omega 3 fatty acids, omega 6 fatty acids, n-acetyl cysteine (nac), furoate, methyl furoate, ethyl furoate, aminocaproic acid, caproic acid, caprilic

acid, capric acid, lauric acid, alpha lipoic acid, R-lipoic acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, phospholipids, phosphatidylcholine, oleic acid, elaidic acid, linoleic acid, linolenic acid, menthol, retinoic acid, vitamin A, retinol, linolelaidic acid, arachidonic acid, phospholipids, phosphatidylcholine, menthol, retinoic acid, vitamin a, retinol, retinal, isotretinoin, curcumin, tretinoin, a-carotene P-carotene retinol, d2 ergosterol, ergocalciferol, 7-dehydrocholesterol, cholecalciferol, 25-hydroxycholecalciferol, calcitriol (1,25-dihydroxycholecalciferol), calcitroic acid, d4 dihydroergocalciferol, alfacalcidol, dihydrotachysterol, calcipotriol, tacalcitol, paricalcitol, tocopherol, naphthoquinone, phylloquinone (kl), menaquinones (k2), menadione (k3), menadiol (k4), thiamine, acefurtiamine, allithiamine, benfotiamine, fursultiamine, octotiamine, prosultiamine, sulbutiamine, riboflavin, niacin, nicotinamide, pantothenic acid, dexpanthenol, pantethine, pyridoxine, pyridoxal phosphate, pyridoxamine, pyritinol, biotin, folic acid, dihydrofolic acid, folinic acid, levomefolic acid, adenosylcobalamin, cyanocobalamin, hydroxocobalamin, methylcobalamin, choline, ascorbic acid, dehydroascorbic acid, 1-docosanol or