Final answer:
Narcan, known scientifically as naloxone, is specifically used to treat opioid overdoses but is ineffective for overdoses caused by substances like cocaine, methamphetamine, or alcohol. It works by blocking opioid receptors to quickly reverse opioid-induced respiratory depression.
Step-by-step explanation:
Narcan, also known as naloxone, is a medication primarily used to treat opioid overdoses. It operates by rapidly blocking the effects of opioids, particularly the potent respiratory depression that could lead to death. However, Narcan is not effective for overdoses caused by non-opioid substances, such as cocaine, methamphetamine, or alcohol. Its mechanism specifically targets opioid receptors and will not counteract the effects of these other drugs, meaning that other forms of medical intervention would be required for these types of overdoses. For opioid overdoses, including drugs like heroin, morphine, oxycodone, and fentanyl, its quick action can save lives by reversing the respiratory depression that is typical with these substances.