Final answer:
Narcan, also known as naloxone, is an opioid antagonist that can reverse the effects of an overdose. The timing of administering Narcan is crucial, with earlier administration being more effective. However, Narcan can still be effective if given later.
Step-by-step explanation:
Narcan, also known as naloxone, is an opioid antagonist that can reverse the effects of an overdose. It works by blocking the opioid receptors in the brain, which helps to restore normal breathing and consciousness.
When it comes to the timing of administering Narcan, it is important to do it as soon as possible after realizing that an overdose has occurred. The sooner Narcan is given, the more effective it is in reversing the overdose. However, it is worth mentioning that Narcan can still be effective even if given later, as it can continue to block the opioids in the body for a period of time.