Methadone is a narcotic analgesic used to treat moderate to severe pain that is not relieved by other pain medicines. Methadone HCl is also used in treating narcotic addiction as part of a treatment program.
Effects on the body
Therapeutic doses of the drug have a sedative and analgesic effect. The drug affects the nervous and cardiovascular system and smooth muscle. Overdose causes suppression of blood circulation, respiratory depression, failure of renal function, pulmonary edema. With chronic use high blood pressure, frequent palpitations, spasms of bile ducts, relaxation and lethargy, hyperglycemia (increased blood glucose level)