[Biotransformation of alimemazine].

After application of alimemazine (1) 14 phenothiazine derivatives were detected in the rat urine. The structure of 9 metabolites was elucidated (TLC detection, UV, MS), which are hydroxy, N-dealkyl, S-oxide, and sulfone derivatives of 1. The hydroxy compounds, which are the main metabolites (greater than 50%), are partly conjugated. 5-10% of sulfones were observed. Some of the metabolites were detected in the feces, too. The relationship of the excretion products in urine and feces is 75:25%.