Pancuronium is classified as which drug type?

• A. Opioid
• B. NMJ blocker
• C. GABA agonist
• D. Dissociative

Answer: (B)

Pancuronium is a neuromuscular blocking agent, specifically an NMJ blocker. It works by acting as a competitive antagonist at nicotinic acetylcholine receptors at the motor endplate, so acetylcholine cannot bind and trigger depolarization. Without depolarization, skeletal muscles cannot contract, producing paralysis. This effect is purely at the neuromuscular junction and does not affect consciousness or pain perception, which is why it’s used alongside anesthesia to facilitate intubation and surgical immobilization. It is not an opioid (which would alter pain perception through CNS receptors), not a GABA agonist (which would enhance CNS inhibition), and not a dissociative (which alters perception and consciousness). Because it doesn’t act on the brain, its paralysis can be reversed with acetylcholinesterase inhibitors to increase acetylcholine availability at the NMJ, allowing recovery of muscle function.