title: Methadone dose assessment in heroin addiction.
abstract: Withdrawal, with measurement of systolic BP and pulse rate, was observed during administration of methadone mixture to heroin addicts after a drug fast of 12 to 24 h. Four subjects were regarded as nonaddicts. In the remainder, there was significant reduction of systolic BP without a titration end point. Nonaddicts and mildly and moderately addicted subjects could be differentiated after a 10-mg dose of methadone. It is hypothesized that tolerance to methadone resembles immunity comparable to that against infections, and not a dose-response curve. Factors making oral methadone less preferable to needle-using addicts include delayed gastric emptying, first passage through the liver, and possible endogenous endorphin/encephalin response. Further studies are suggested.
mesh_terms: D000284:Administration, Oral; D001794:Blood Pressure; D004361:Drug Tolerance; D006556:Heroin Dependence / Q000503:physiopathology / Q000534:rehabilitation*; D006801:Humans; D007275:Injections, Intravenous; D008691:Methadone / Q000008:administration & dosage*; D011674:Pulse
chemical_list: D008691:Methadone