Increased effect w/ halogenated volatile anesth, suxamethonium, corticosteroids (long-term use); antibiotics (aminoglycosides, lincosamide, polypeptide, acylamino-penicillin), diuretics, quinidine, quinine, Mg salts, Ca-channel blockers, lithium salts, local anesth (lidocaine IV, epidural bupivacaine), phenytoin or β-blockers. Recurarization w/ aminoglycoside, lincosamide, polypeptide, acylamino-penicillin, quinidine, quinine, Mg salts. Decreased effect w/ phenytoin or carbamazepine; PIs (gabexate, linastatin). Attenuated/potentiated neuromuscular-blocking effect w/ other non-depolarizing neuromuscular blockers, suxamethonium. Quicker onset of lidocaine action.