modified on 3 April 2009 at 21:43 ••• 2,281 views


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Diphenhydramine is used both clinically and/or recreationally in conjunction with opioids to relieve itching and act as an analgesia potentiator.

It is used recreationally as a deliriant, depressant, in combination with dextromethorphan, or booster for alcohol.

Diphenhydramine is a moderate CYP2D6 inhibitor, and as a result can cause increases in blood levels of drugs that are CYP2D6 substrates. Diphenhydramine can also have an additive effect with other CNS depressants. Due to its interaction with a broad array of medications, combining diphenhydramine with other medications without medical supervision could have unanticipated and potentially hazardous results.