A solid pharmaceutical preparation which contains either a dibenz[b,e]oxepine derivative represented by the following formula (I) [wherein A represents a single bond, -CH=CH-, or (CH2)n- (wherein n is an integer of 1-3)； and R<；1>； and R<；2>； are the same or different and each represents hydrogen or lower alkyl or represents a heterocyclic group in cooperation with the adjacent nitrogen atom] or a pharmaceutically acceptable salt of the derivative and is excellent in storage stability such as light stability. The solid pharmaceutical preparation comprises: a raw pharmaceutical preparation containing a dibenz[b,e]oxepine derivative represented by the following formula (I) or a pharmaceutically acceptable salt of the derivative； and a coating film or capsule containing at least 0.6 parts by weight of a light-shielding agent per 100 parts by weight of the raw pharmaceutical preparation.
