Increased effect w/ halogenated volatile anaesth; after intubation w/ suxamethonium; w/ high doses of thiopental, methohexital, ketamine, fentanyl, gammahydroxybutyrate, etomidate, propofol; other non-depolarizing neuromuscular blocking agents; prior administration of suxamethonium; long-term concomitant use w/ corticosteroids in the ICU. Altered magnitude &/or duration of effect w/ aminoglycosides, lincosamides (eg, lincomycin & clindamycin), polypeptide antibiotics, acylamino-penicillin antibiotics, tetracyclines, high doses of metronidazole; diuretics, thiamine, MAOIs, quinidine & its isomer quinine, protamine, adrenergic blocking agents; Mg salts, Ca channel blocking agents, lithium salts, local anaesth (lidocaine IV, bupivacaine epidural) & acute administration of phenytoin or β-blocking agents. Reports of recurarization after post-op administration of aminoglycoside, lincosamide, polypeptide & acylamino-penicillin antibiotics, quinidine, quinine & Mg salts. Decreased effect w/ neostigmine, edrophonium, pyridostigmine, aminopyridine derivatives; prior chronic administration of corticosteroids, phenytoin or carbamazepine; noradrenaline, azathioprine (only transient & limited effect), theophylline, Ca chloride, KCl; PIs (gabexate, ulinastatin). Administration of other non-depolarizing neuromuscular blocking agents in combination w/ rocuronium Br may produce attenuation or potentiation of the neuromuscular block. Suxamethonium given after the administration of rocuronium Br may produce potentiation or attenuation of the neuromuscular blocking effect of rocuronium Br. Quicker onset of action of lidocaine. Physical incompatibility when added to soln containing: amphotericin, amoxicillin, azathioprine, cefazolin, cloxacillin, dexamethasone, diazepam, enoximone, erythromycin, famotidine, furosemide, hydrocortisone Na succinate, insulin, intralipid, methohexital, methylprednisolone, prednisolone Na succinate, thiopental, trimethoprim & vancomycin.