was heading 1975-94 (see under PROMETHAZINE 1980-90); METHYLPROMETHAZINE was see THIAZINAMIUM 1980-94; use PROMETHAZINE to search THIAZINAMIUM 1975-94; a quaternary ammonium phenothiazine, usually as the methyl sulfate, that has both histamine 1 and acetylcholine blocking actions
