Risk of serotonin syndrome w/ irreversible non-selective MAOIs; reversible, selective MAO-A inhibitor eg, moclobemide; linezolid; irreversible, selective MAO-B inhibitor eg, selegiline, rasagiline; serotonergic medicinal products eg, opioids (tramadol, sumatriptan); antidepressants w/ serotonergic effect & herbal remedies containing St. John's wort (
Hypericum perforatum). Concomitant use w/ antidepressants (eg, TCAs, SSRIs, SNRIs), neuroleptics (phenothiazines, thioxanthenes & butyrophenones), mefloquin, bupropion, tramadol. Increased exposure w/ bupropion. Increased AUC w/ ketoconazole, fluconazole. Increased exposure w/ strong CYP3A4 & CYP2C9 inhibitors, CYP2D6 poor metabolisers. Decreased AUC w/ CYP450 inducers eg, rifampicin, carbamazepine, phenytoin. Potential increased risk of bleeding w/ oral anticoagulants or antiplatelet medicinal products. Enhanced effect w/ lithium or tryptophan. False +ve results in urine enzyme immunoassays for methadone.