Naloxone is an opioid antagonist used to reverse opioid effects.

• A. It is an analgesic
• B. It reverses opioid effects
• C. It is a sedative
• D. It is a muscle relaxant

Answer: (B)

Naloxone is an opioid receptor antagonist, so its main job is to block or reverse the effects of opioids. It binds to mu-opioid receptors with high affinity, preventing opioid molecules from activating them, which quickly reverses problems like respiratory depression and sedation caused by opioid drugs. It does not provide pain relief itself, nor does it cause sedation or muscle relaxation; those are effects opioids can produce, not effects of naloxone. In practice, this makes it the correct choice when the statement describes its purpose as reversing opioid effects.