SOLID FORMS OF (±)-O-DESMETHYLVENLAFAXINE SALTS

1 . Solid state form of a salt of (±)-1-[2-(dimethylamino)-1-(4-hydroxyphenyl)ethyl]cyclohexanol [(±)-O-desmethylvenlafaxine salt], wherein the salt of (±)-O-desmethylvenlafaxine is an oxalate salt, a benzoate salt or a lactate salt.

2 . The solid state (±)-O-desmethylvenlafaxine salt of claim 1 , which is in a crystalline form or in an amorphous form; and wherein the solid state form is anhydrous and/or solvent-free form or a hydrate and/or a solvate form.

3 . The solid state (±)-O-desmethylvenlafaxine salt of claim 1 , having the following characteristics, wherein:

a) the solid state form of (±)-O-desmethylvenlafaxine oxalate salt is characterized by one or more of the following properties:

i) a powder X-ray diffraction pattern substantially in accordance with FIG. 1 ;

ii) a powder X-ray diffraction pattern having peaks at about 5.23, 10.49, 11.61, 15.09 and 26.42±0.2 degrees 2-theta;

iii) a powder X-ray diffraction pattern having additional peaks at about 9.50, 10.06, 11.16, 12.93, 14.78, 15.94, 17.14, 17.81, 18.95, 21.06, 21.65, 22.49, 24.63, 24.97, 25.83 and 31.68±0.2 degrees 2-theta; and

iv) a differential scanning calorimetric (DSC) thermogram substantially in accordance with FIG. 2 ;

b) the solid state form of (±)-O-desmethylvenlafaxine benzoate salt is characterized by one or more of the following properties:

i) a powder X-ray diffraction pattern substantially in accordance with FIG. 3 ;

ii) a powder X-ray diffraction pattern having peaks at about 5.81, 12.16, 13.22, 15.90 and 20.46±0.2 degrees 2-theta;

iii) a powder X-ray diffraction pattern having additional peaks at about 14.74, 15.66, 16.14, 17.65, 19.40, 19.73, 19.85, 22.42, 24.53, 24.81, 25.23, 26.65 and 28.62±0.2 degrees 2-theta; and

iv) a differential scanning calorimetric (DSC) thermogram substantially in accordance with FIG. 4 ; and

c) the solid state form of (±)-O-desmethylvenlafaxine lactate salt is characterized by one or more of the following properties:

i) a powder X-ray diffraction pattern substantially in accordance with FIG. 5 ;

ii) a powder X-ray diffraction pattern having peaks at about 12.20, 13.28, 15.95, 16.20 and 19.72±0.2 degrees 2-theta;

iii) a powder X-ray diffraction pattern having additional peaks at about 11.51, 14.50, 17.31, 19.94, 20.49, 22.48, 24.51, 24.80, 25.27, 26.72 and 28.68±0.2 degrees 2-theta; and

iv) a differential scanning calorimetric (DSC) thermogram substantially in accordance with FIG. 6 .

4 . A process for the preparation of solid (±)-O-desmethylvenlafaxine salt of any one of claims 1 to 3 , comprising:

a) providing a solution of (±)-O-desmethylvenlafaxine free base in a solvent selected from the group consisting of water, an alcohol, a ketone, a chlorinated hydrocarbon, a hydrocarbon, a nitrile, an ester, an ether, a polar aprotic solvent, and mixtures thereof;

b) combining the solution obtained in step-(a) with an acid selected from the group consisting of oxalic acid, benzoic acid and lactic acid; and

c) optionally, heating the reaction mass obtained in step-(b) to form a clear solution;

d) optionally, substantially removing the solvent from the solution obtained in step-(b) or step-(c) to obtain a residue followed by dissolving the residue in a solvent with the proviso that the solvent is having less polarity than the solvent used in step-(a);

e) isolating solid state form of (±)-O-desmethylvenlafaxine salt from the solution, obtained in step-(b), step-(c) or step-(d), by forcible or spontaneous crystallization.

5 .- 6 . (canceled)

7 . The process of claim 4 , wherein the solvent is selected from the group consisting of water, methanol, ethanol, isopropanol, tert-butanol, methylene chloride, diisopropyl ether, acetonitrile, and mixtures thereof.

8 . The process of claim 4 , wherein the acid in step-(b) is used directly or in the form of the acid dissolved in a suitable solvent; wherein the acid in step-(b) is used in a molar ratio of about 1 to 2 moles per 1 mole of (±)-O-desmethylvenlafaxine free base; wherein the combining of the solution with the acid in step-(b) is carried out by adding the acid to the solution of (±)-O-desmethylvenlafaxine free base or by adding the (±)-O-desmethylvenlafaxine free base solution to the acid; wherein the reaction mass in step-(c) is heated at a temperature of about 40° C. to the reflux temperature of the solvent used for at least 20 minutes; and wherein the solution obtained in step-(b) or step-(c) is optionally subjected to carbon treatment or silica gel treatment.

9 . The process of claim 8 , wherein the acid is used in a molar ratio of about 1 to 1.1 moles per 1 mole of (±)-O-desmethylvenlafaxine free base; wherein the addition in step-(b) is carried out at a temperature of below about 60° C. for at least 15 minutes; and wherein the reaction mass obtained after addition of the acid in step-(b) is further stirred for at least 20 minutes at a temperature of about 20° C. to about 35° C.

10 .- 11 . (canceled)

12 . The process of claim 4 , wherein the removal of solvent in step-(d) is accomplished by evaporation, vacuum drying, spray drying, freeze drying or a combination thereof; wherein the crystallization in step-(e) is initiated by cooling, seeding, partial removal of the solvent from the solution, by adding an anti-solvent to the solution or a combination thereof.

13 . (canceled)

14 . The process of claim 4 , wherein the crystallization in step-(e) is carried out by stirring the solution at a temperature of below 30° C. for about 30 minutes to about 15 hours; wherein the solid form of (±)-O-desmethylvenlafaxine salt obtained in step-(e) is recovered by filtration, filtration under vacuum, decantation, and centrifugation, or a combination thereof; wherein the pure solid form of (±)-O-desmethylvenlafaxine salt obtained in step-(e) is further dried under atmospheric pressure or reduced pressures at a temperature of about 35° C. to about 70° C.; and wherein the solid form of (±)-O-desmethylvenlafaxine salt obtained has a total purity of about 99% to about 99.9%.

15 . (canceled)

16 . The solid state (±)-O-desmethylvenlafaxine salt of claim 1 , wherein the solid form of (±)-O-desmethylvenlafaxine oxalate salt has a water content of about 0.5% to about 15% by weight; and wherein the solid form of (±)-O-desmethylvenlafaxine lactate salt has a water content of about 0.5% to about 15% by weight.

17 . The solid state (±)-O-desmethylvenlafaxine salt of claim 16 , wherein the (±)-O-desmethylvenlafaxine oxalate salt has a water content of about 8.5% to about 10.5% by weight; and wherein the solid form of (±)-O-desmethylvenlafaxine lactate salt has a water content of about 7.5% to about 9.5% by weight.

18 .- 86 . (canceled)

87 . A pharmaceutical composition comprising a solid state form of (±)-O-desmethylvenlafaxine salt and one or more pharmaceutically acceptable excipients, wherein the salt of (±)-O-desmethylvenlafaxine is an oxalate salt, a benzoate salt or a lactate salt; and wherein the pharmaceutical composition is prepared by a process comprising combining the solid state form of (±)-O-desmethylvenlafaxine salt with one or more pharmaceutically acceptable excipients.

88 .- 92 . (canceled)

93 . The pharmaceutical composition of claim 87 , wherein the solid state form of (±)-O-desmethylvenlafaxine salt has a D 90 particle size of less than or equal to about 500 microns.

94 . The pharmaceutical composition of claim 93 , wherein the D 90 particle size is less than or equal to about 400 microns; less than or equal to about 200 microns; less than or equal to about 100 microns; less than or equal to about 60 microns; or less than or equal to about 15 microns.

95 .- 98 . (canceled)