Fexofenadine crystal form and processes for its preparation thereof

A process for preparing crystalline fexofenadine HCl salt comprising acidifying a basic aqueous solution of fexofenadine free base containing a mixture of water and an organic solvent to precipitate the crystalline form, and converting the crystal to the HCl salt.

A process for preparing crystalline fexofenadine HCl salt comprising the steps of preparing a solution of fexofenadine keto acid in a water miscible organic solvent in the presence of a base and water;

• adding a reducing agent to the solution to reduce the keto-acid;
• acidifying reaction mixture obtained from the reduction to precipitate fexofenadine free base, recovering the crystalline form of fexofenadine free base and converting it HCl salt.