Ecstasy: pharmacodynamic and pharmacokinetic interactions.

At "raves," young people dance and ingest illicit drugs, the most common of which is MDMA (N-methyl-3,4,-methylenedioxymethamphetamine) or "ecstasy." This drug is metabolized principally through the cytochrome P450 (CYP450) 2D6 enzyme. Pharmacokinetic drug-drug interactions can occur if MDMA is combined with other recreational or therapeutic drugs that are 2D6 inhibitors. Ecstasy concentration may increase to cause toxicity. Since ecstasy is pro-serotonergic, it may also be involved in pharmacodynamic drug-drug interactions when other pro-serotonergic drugs are combined with it, leading to a central serotonin syndrome. Some drugs are both pro-serotonergic and CYP450 2D6 inhibitors and, if co-administered with ecstasy, may cause both pharmacokinetic and pharmacodynamic drug-drug interactions.