Analgesics obtained by reacting a primary amine and an aldehyde

A pharmaceutical composition having analgesic, anti-inflammatory, and anti-pyretic activity which comprises, as the active ingredient, an analgesic, anti-inflammatory and anti-pyretic effective amount of at least one compound selected from the group consisting of compounds of the formula R--Z--R', in which each of R and R', which may be the same or different, represents a phenyl radical which is optionally substituted by at least one substituent selected from a halogen atom, --OC.sub.2 H.sub.5, --OCH.sub.3, --CH.sub.3, --COOC.sub.2 H.sub.5, --COOCH.sub.3, and --COOH radical;

• and Z represents CH--NH-- in which the radical CH-- of said amino group forms part of a heterocyclic structure of the formula ##EQU5## in which the two carbon atoms, connected by a double bond, form part of the radical R or R' in association with a pharmaceutically acceptable carrier material.