Suboxone is a medication used to treat opioid dependence. It contains two active ingredients: buprenorphine and naloxone. Buprenorphine is a partial opioid agonist, which means it binds to opioid receptors in the brain but produces a weaker effect than full opioids like heroin or oxycodone. Naloxone is an opioid antagonist, which means it blocks the effects of opioids.