Potential interaction w/ other CNS drugs. Not recommended w/ alcohol. Enhanced serotonergic effects w/ lithium. Rare reports of weakness, hyperreflexia & incoordination w/ sumatriptan. Decrease C
max & AUC of ketoconazole. Increased plasma conc w/ CYP2C19 inhibitors (eg, omeprazole, esomeprazole, fluvoxamine, lansoprazole, ticlopidine) or cimetidine. Caution when co-administered w/ CYP2D6 substrates w/ narrow therapeutic index eg, flecainide, propafenone, metoprolol (when used in cardiac failure), or some CNS-acting medicinal products that are mainly metabolized by CYP2D6 eg, antidepressants (eg, desipramine, clomipramine & nortriptyline) or antipsychotics (eg, risperidone, thioridazine, haloperidol). Increase plasma levels of desipramine. Increase C
max & AUC of metoprolol. Potentiated risk of bleeding w/ NSAIDs & aspirin. Altered anticoagulant effects, including increased risk of bleeding w/ warfarin.