Which of these is the reversal drug for muscle relaxant overdose?

• A. Naloxone
• B. Flumazenil
• C. No reversal drug
• D. Protamine

Answer: (C)

Muscle relaxant overdose doesn’t have a single universal antidote. Some muscle relaxants have reversal strategies, but others do not, so there isn’t one antidote that works for all cases. For nondepolarizing neuromuscular blockers (like rocuronium, vecuronium, pancuronium), reversal can be achieved with acetylcholinesterase inhibitors (such as neostigmine) often paired with an anticholinergic, and sugammadex can rapidly reverse certain agents like rocuronium and vecuronium. But for depolarizing blockers such as succinylcholine, there is no antidote that reverses the effect immediately—the patient’s function gradually returns as the drug wears off. Because there isn’t a single reversal drug applicable to all muscle relaxants, the correct general answer is that there is no reversal drug. For contrast, naloxone reverses opioids, flumazenil reverses benzodiazepines, and protamine reverses heparin.