The neuromuscular and cardiovascular activities of pancuronium were compared with those of its 16(3 monoquaternary congener, Org NC 45, in the anaesthetized rat, cat and rhesus monkey. In the rat Org NC 45 was 3.4 times less potent as a neuromuscular blocking agent than was pancuronium. In the cat, both drugs were found to be approximately equally eliminated by the liver, whereas renal eliminat...