Crystalline form of azelastine

摘要

Polymorph I of azelastine of formula (I), its preparation process which comprises the following steps: a) crystallizing azelastine from a solution of said compound in isobutylmethylketone; b) isolating the polymorph I of azelastine that appears in the prior step; and c) removing the organic solvent from the polymorph I of azelastine thus obtained, and its use as antihistamine.