Which drug class is an antidote for acetaminophen overdose?

Acetylcysteine is recognized as the antidote for acetaminophen overdose due to its mechanism of action that helps to replenish glutathione levels in the liver. Acetaminophen is metabolized into a toxic metabolite that can lead to hepatotoxicity when present in excessive amounts. Acetylcysteine works by binding to this toxic metabolite, thereby preventing or minimizing damage to liver cells and facilitating the safe elimination of acetaminophen from the body.

Its administration can significantly reduce the risk of liver damage if given in a timely manner, usually within 8 to 10 hours post-overdose. This makes acetylcysteine an essential medication in treating acetaminophen overdoses and highlights the importance of prompt medical intervention in such cases.

The other classes of drugs mentioned do not serve this purpose. Muscle relaxants, antiepileptic agents, and bronchodilators do not have the properties needed to counteract the effects of acetaminophen toxicity and do not function as antidotes in this context.