This invention provides a pridopidine base in a solid form, a method of preparing the solid pridopidine base, and a composition comprising the pridopidine base including a pharmaceutical composition.本發明提供一種呈固體形式之普多比啶(pridopidine)鹼,一種製備該固體普多比啶鹼之方法及一種包含該普多比啶鹼之組合物,該組合物包括醫藥組合物。