Increased effects w/ halogenated volatile anesth, suxamethonium, corticosteroids; aminoglycoside, lincosamide, polypeptide & acylamino-penicillin antibiotics; diuretics, quinidine, quinine, Mg salts, Ca-channel blockers, lithium salts, local anesth (lidocaine IV, bupivacaine epidural), acute administration of phenytoin or β-blockers. Decreased effects w/ phenytoin or carbamazepine; PIs eg, gabexate, ulinastatin. Potentiated or attenuated neuromuscular blocking effects w/ other non-depolarizing neuromuscular blockers, suxamethonium. Quicker onset of action of lidocaine.