Methadone is a medicine which is a type of opioid and may cause a bad reaction where your breathing slows or potentially stops. Naloxone is a medicine used to reverse the effects of opioids. Methadone is used to relieve severe pain or to treat opioid addiction. Methadone is a synthetic (man made) substance that works by acting on mu-opioid receptors in a similar way to morphine to provide pain relief. It inhibits ascending pain pathways, altering the perception of and response to pain. Methadone is a powerful drug used for pain relief and treatment of drug addiction. Learn more about what methadone is, why it’s used, side effects, risks, and how to store and dispose of it. Methadone is a medication used to treat Opioid Use Disorder (OUD). Methadone is a long-acting full opioid agonist, and a schedule II controlled medication. Methadone used to treat those with a confirmed diagnosis of opioid use disorder (OUD) can only be dispensed through a SAMHSA certified OTP. Methadone injection is used to relieve severe and persistent pain that requires daily opioid treatment and when other pain medicines did not work well enough or cannot be tolerated. Methadone is also used together with medical supervision and counseling to treat opioid use disorder (eg, heroin or other morphine-like drugs). Methadone belongs to the group of medicines called opioid analgesics (pain medicines). It acts on the central nervous system (CNS) to relieve pain. Methadone is used for the treatment of opioid use disorder. [21]. It may be used as maintenance therapy or in shorter periods to manage opioid withdrawal symptoms. Its use for the treatment of addiction is usually strictly regulated. Methadone has a slow onset and long duration of action, suitable for long-term management of pain. It works for pain relief by acting on the same receptors acted on by natural opioids such as morphine. Methadone is a long-acting opioid medication that is used to reduce withdrawal symptoms in people addicted to heroin or other narcotic drugs, and it can also be used as a pain reliever. Methadone is a synthetic opioid medication used to treat moderate-to-severe chronic pain, as well as opioid use disorder. While methadone has legitimate medical uses, it also carries the potential for misuse, physical dependence, and addiction.