THESE DRUGS WHICH MAY ENHANCE THE NEUROMUSCULAR BLOCKING ACTION OF SUCCINYL CHOLINE CHLORIDE INCLUDING: PROMAZINE, APROTININ, NON-PENICILLIN ANTIBIOTICS, QUINIDINE, BETA-ADRENERGIC BLOCKERS, PROCAINAMIDE, LIDOCAINE, TRIMETHAPHAN AND QUININE. THE NEUROMUSCULAR BLOCKING EFFECT OF SUCCINYL CHOLINE CHLORIDE MAY BE ENHANCED BY DRUGS THAT REDUCE PLASMA CHOLINESTERASE ACTIVITY (SUCH AS CHRONICALLY ADMINISTERED ORAL CONTRACEPTIVES, GLUCOCORTICOIDS OR MAO INHIBITORS).