Concomitant use w/ inhalation anesth eg, halothane, isoflurane & enflurane; antibiotics eg, aminoglycosides, polymyxin, spectinomycin, tetracyclines, lincomycin & clindamycin; antiarrhythmics eg, propranolol, Ca channel blockers, lignocaine, procainamide & quinidine; diuretics eg, furosemide, mannitol, thiazides & acetazolamide; Mg sulfate; ketamine; lithium salts; ganglion-blocking agents eg, trimetaphan, hexamethonium.