Increased effect w/ enflurane, isoflurane, halothane, ketamine, other non-depolarising neuromuscular blockers, aminoglycosides, polymyxins, spectinomycin, tetracyclines, lincomycin, clindamycin, antiarrhythmics, diuretics, Mg & lithium salts, ganglion-blocking drugs. Increased sensitivity w/ β-blockers, antirheumatic drugs, trimetaphan, chlorpromazine, steroids, phenytoin. Prolonged effect w/ suxamethonium. Decreased effect by phenytoin or carbamazepine. Shortened duration & diminished magnitude w/ anticholinesterases. Incompatibility w/ lactated ringer's inj, ketorolac trometamol, propofol inj emulsion. Not to be mixed in same syringe w/ alkaline soln eg, Na thiopentone.