Potentiated by inhalational anaesth eg, enflurane, isoflurane, sevoflurane, halothane. Increased magnitude &/or duration w/ aminoglycosides, polymyxins, spectinomycin, tetracyclines, lincomycin, clindamycin; propranolol, Ca-channel blockers, lidocaine, procainamide, quinidine; furosemide, possibly thiazides, mannitol, acetazolamide; Mg & lithium salts; ketamine; trimetaphan, hexamethonium. Prolonged neuromuscular-blocking action w/ drugs reducing plasma cholinesterase activity eg, anti-mitotic drugs, MAOIs, ecothiopate iodide, pancuronium, organophosphates, anticholinesterases, certain hormones, bambuterol, SSRI. Aggravated or unmasked latent myasthenia gravis w/ β-blockers, anti-arrhythmics, antirheumatics, trimetaphan, chlorpromazine, steroids, phenytoin, lithium. Prolonged & complex block w/ suxamethonium Cl.