Potentiated neuromuscular block w/ halogenated volatile anaesth. Prolonged duration of neuromuscular block or myopathy w/ corticosteroids. Recurarisation w/ post-op aminoglycoside, lincosamide, polypeptide & acylamino-penicillins, quinidine, quinine & Mg salts. Decreased effects w/ prior chronic administration of phenytoin or carbamazepine; Ca chloride, K chloride; protease inhibitors (gabexate, ulinastatin). May produce attenuation or potentiation of neuromuscular block w/ non-depolarizing neuromuscular blockers & suxamethonium. May result in quicker onset of action w/ lidocaine. Diuretics, Ca-channel blocking agents, lithium salts, local anaesth, phenytoin or β-blocking agents.