Knowra Methadone Methadone Methadone is a long-acting synthetic opioid used to relieve pain and, under medical supervision, treat opioid use disorder by reducing withdrawal and cravings.
Opioid receptor : A cell-surface receptor that responds to endogenous opioid peptides and opioid drugs. Methadone acts mainly as an agonist at the mu-opioid receptor.
Opioid use disorder : A chronic, treatable condition involving impaired control over opioid use despite harmful consequences. Methadone treatment reduces withdrawal and cravings without requiring immediate abstinence.
Opioid : A substance that acts on opioid receptors, including medicines and drugs with effects on pain and reward. Methadone belongs to this broader drug class.
Heroin : A fast-acting opioid drug that is converted in the body to morphine. Unlike rapidly reinforcing heroin, supervised methadone provides sustained opioid effects.
Mu-opioid receptor : An opioid receptor subtype that mediates analgesia, respiratory depression, and many opioid effects. Methadone activates this receptor to relieve pain and suppress withdrawal.
Opioid agonist therapy : Treatment of opioid use disorder with medications that activate opioid receptors under clinical supervision. Methadone is one of the principal medications used in this treatment approach.
Opioid tolerance : Reduced response to an opioid after repeated exposure, often requiring higher doses for the same effect. Tolerance affects dose needs, while methadone accumulation can still cause delayed toxicity.
Naltrexone : An opioid receptor antagonist used to prevent relapse in opioid use disorder and treat other conditions. Unlike methadone, it blocks opioid effects and requires withdrawal before initiation.
Methadone pharmacokinetics : The absorption, distribution, metabolism, and elimination of methadone in the body. Its highly variable, long half-life can cause drug accumulation during dose adjustment.
Buprenorphine : A partial opioid agonist used to treat opioid use disorder and pain. It is a major alternative medication with a different receptor profile and prescribing pathway.
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