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Dextromethorphan is rapidly absorbed from the gastrointestinal tract and converted into the active metabolite dextrorphan in the liver by the cytochrome P450 enzyme CYP2D6. The average dose necessary for effective antitussive therapy is between 10 and 45 mg, depending on the individual.
Dextromethorphan's effects have been divided into four plateaus. [14] The first plateau (1.5 to 2.5 mg per kg body weight) is described as having euphoria, auditory changes, mild stimulation, and change in perception of gravity. The second plateau (2.5 to 7.5 mg/kg) causes intense euphoria, vivid imagination, and closed-eye hallucinations.
Bupropion inhibits the metabolism of dextromethorphan by inhibiting the enzyme CYP2D6, the major enzyme responsible for the metabolism of dextromethorphan. [1] This in turn improves the bioavailability of dextromethorphan, prolongs its half-life, prevents its metabolism into dextrorphan , and increases the ratio of dextromethorphan to ...
dextromethorphan 11%, quinidine 70-80%. Food has no effect on absorption. Metabolism: Liver, extensive. Dextromethorphan is catalyzed by CYP2D6. Quinidine is metabolized by CYP3A4 and competitively inhibits the metabolism of dextromethorphan to increase and prolong plasma concentrations of dextromethorphan: Elimination half-life
The provider of a dextromethorphan containing product must acquire proof of age if they believe that the potential purchaser is below the age of 18. Any person found to possess more than one gram of pure dextromethorphan without the required credentials is subject to a $1000 fine for the first offense and a $2500 fine for each subsequent offense.
The drugs and the enzymes they probe are as follows - caffeine (probes CYP1A2, N-acetyltransferase 2, xanthine oxidase), midazolam (probes CYP3A), omeprazole (probes CYP2C19) and dextromethorphan (probes CYP2D6). After giving the cocktail, the concentrations of the drugs and their metabolites in plasma (for midazolam and omeprazole) and urine ...
Coricidin, Coricidin 'D' (decongestant), or Coricidin HBP (for high blood pressure), is the name of an over-the-counter cough and cold drug containing dextromethorphan (a cough suppressant) and chlorpheniramine maleate (an antihistamine). [1] Introduced by Schering-Plough in 1949 as one of the first antihistamines, it is now owned by Bayer.
Dextromethorphan – An over-the-counter cough suppressant, as well as dissociative hallucinogen. Levomethorphan – A potent opioid analgesic that was never clinically developed; a prodrug of the powerful opioid agonist analgesic levorphanol (Levo-Dromoran). Racemethorphan is the racemic mixture of both of these stereoisomers! [2]
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