Stable pharmaceutical compositions of desloratadine and processes for preparation of polymorphic forms of desloratadine

A process for preparing a mixture of crystalline Form I and Form II of desloratadine comprising combining a solution of desloratadine in an organic solvent selected from the group consisting of a C2 to C5 alkyl acetate, butanol, isobutanol, toluene and chloroform with a C5 to C12 hydrocarbon to precipitate the mixture, recovering the mixture, wherein before combining, the solution has a temperature that is at least about 40° C. higher than the hydrocarbon.