How Naloxone in Suboxone Blocks Opioid Effects When Injected

Suboxone contains buprenorphine (a partial opioid agonist) and naloxone (an opioid antagonist). Buprenorphine provides pain relief and euphoria by activating opioid receptors. Naloxone is included to deter misuse by injection.

Blocking Mechanism

When Suboxone is injected, naloxone rapidly blocks buprenorphine's effects, precipitating withdrawal. This blocking begins within minutes and lasts several hours, depending on dose and individual metabolism.

Important Limitation

Naloxone only blocks buprenorphine—not other opioids like heroin or morphine. Injecting Suboxone to get high still carries overdose risk.