Cross-sensitivity with other neuromuscular-blocking agents may occur (use extreme caution in previous anaphylactic reactions). Resistance may occur in burn patients (>30% of body) for period of 5-70 days postinjury. Alkalosis, hypercalcemia, demyelinating lesions, peripheral neuropathies, denervation, infection, muscle trauma, and diabetes mellitus may result in antagonism of neuromuscular blockade. Electrolyte abnormalities, severe hyponatremia, severe hypocalcemia, severe hypokalemia, hypermagnesemia, neuromuscular diseases, acidosis, acute intermittent porphyria, Eaton-Lambert syndrome, myasthenia gravis, renal failure, and hepatic failure may result in potentiation of neuromuscular blockade. Use with caution in hepatic or renal impairment, and in the elderly. Resistance may occur in immobilized patients.