Candocuronium iodide (INN, formerly chandonium, HS-310) is an aminosteroid neuromuscular-blocking drug. Its use in anesthesia for endotracheal intubation and to provide skeletal muscle relaxation during surgery or mechanical ventilation was briefly evaluated in clinical studies in India. However, further development was discontinued due to attendant cardiovascular effects, primarily tachycardia that was about the same as the clinically established pancuronium bromide. Candocuronium demonstrated a short duration and a rapid onset of action, with little or no ganglion blocking activity, with a greater potency than pancuronium.