The present invention relates to a process of preparation of Crystal Forms of 4- (cyclopropylmethoxy)-N-(3,5-dichloro-1-oxidopyridin-4-yl)-5-met hoxypyridine-2- carboxamide of formula (I), said Crystal Forms which are designated as Crystal Forms A to I A and their use as a medicament.La presente invención se refiere a un procedimiento de preparación de formas cristalinas de la 4-(ciclopropilmetoxi)-N-(3 ,5-dicloro-1-oxidopiridin-4-iI)-5-metoxipiridin- 2-carboxamida de fórmula (I), dichas formas cristalinas que se denominan formas cristalinas A a I y su uso como medicamento.
