2 butanone methylisobutylketone etc the esters such as the alkyl acetates the aliphatic or aromatic hydrocarbons such as n hexane benzene toluene xylenes etc the non cyclic or cyclic ethers such as ethyl ether tetrahydrofuran 1 4 dioxane etc the chlorinated hydrocarbons such as methylene chloride chloroform carbon tetrachloride perchloroethylene etc alkylamides such as dimethylformamide and dimethylacetamide and mixtures of said solvents and or with water the preferred solvents for the purposes of the present invention are the short chain aliphatic alcohols and or mixtures thereof with aromatic hydrocarbons being particularly preferred 2 propanol and or mixtures of 2 propanol and toluene when paroxetine maleate is formed u201c in situ u201d in the solution it is preferred to use 2 propanol as solvent and when the solution is prepared from the form a it is preferred to use a mixture of 2 propanol and toluene in volumetric proportions ranging from 10 90 to 90 10 preferably from 35 65 to 85 15 variable concentrations of the paroxetine maleate solution may be used concentrations ranging from 150 g l to 250 g l being preferred the form b of paroxetine maleate is precipitated from the solution by any of the techniques known to the man of the art among which the most usual is gradually to cool the solution to within a temperature gradient sufficiently broad as to produce a solubility differential of the form b in the solvent system between the upper and lower.