Naloxone is used to reverse the effects of which category of medications?

• A. Opioids
• B. Benzodiazepines
• C. Stimulants
• D. Antidepressants

Answer: (A)

Naloxone reverses the effects of opioids by acting as a competitive antagonist at mu-opioid receptors, displacing opioid molecules and rapidly restoring CNS function and breathing. This makes it the go-to reversal agent for opioid overdoses, including heroin, fentanyl, and prescription opioids. It doesn’t reverse the effects of benzodiazepines, stimulants, or antidepressants—these drugs don’t exert their overdose effects primarily through opioid receptors. (There are other agents for those drug classes, but none provides a direct, reliable reversal like naloxone does for opioids.) Be aware that naloxone’s effect can wear off before some opioids do, so repeated dosing or a continuous infusion and close monitoring are often needed to prevent re-narcotization.