What is the reversal agent for fentanyl?

Fentanyl is a potent synthetic opioid used for pain management, and in cases of overdose, it can lead to respiratory depression or even respiratory arrest. The reversal agent for fentanyl is Narcan, also known as naloxone. Narcan works by competitively binding to the opioid receptors in the brain, effectively displacing fentanyl and reversing its effects.

It is often administered in cases of suspected opioid overdose to restore normal breathing and consciousness. Narcan's effectiveness in reversing the respiratory effects of opioids, including fentanyl, makes it the go-to antidote in emergency medical situations.

The other substances mentioned do not serve as opioid reversal agents. For instance, flumazenil is used for benzodiazepine sedation reversal, atropine is primarily used as an anticholinergic agent for bradycardia and certain types of poisoning, and acetylcysteine is an antidote for acetaminophen overdose. Thus, Narcan is recognized as the appropriate and effective treatment for reversing the effects of fentanyl.