Patients can be helped to break free of addictive or habit-forming narcotics and anti-depressants, by treatment using two drugs. One drug is dextromethorphan (DM), which has been used for decades as an anti-tussive (cough-suppressing) drug in cough syrups. The other drug is an oxidase inhibitor which suppresses activity of a liver enzyme called cytochrome P450-2D6 (also called debrisoquin hydroxylase, sparteine monooxygenase, cytochrome P450-DB, and CYP2D6). In most patients, this oxidase enzyme rapidly degrades DM and converts it into a metabolite called dextrorphan. An oxidase inhibitor (such as quinidine) which suppresses cytochrome P450-2D6 activity increases the half-life and concentration of DM in the circulating blood. When this combined treatment was administered orally to patients who had become dependent on morphine and anti-depressant drugs because of chronic intractable pain, it initially helped the patients reduce their dosages of morphine and other drugs, including anti-depressants. When additional testing was done, the combined treatment allowed patients to entirely terminate all use of morphine and anti-depressants, with minimal withdrawal or other adverse effects. Importantly, these same patients received no substantial benefit from taking dm by itself, without an oxidase inhibitor. Accordingly, the combination of dextromethorphan plus an anti-oxidase drug can allow at least some patients to break entirely free of narcotics and/or anti-depressants, even after years of use for chronic pain and other medical problems, even when they are not substantially helped by dextromethorphan alone.

sparteine/cough

Dextromethorphan and oxidase inhibitor for weaning patients from narcotics and anti-depressants

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