Selective/non-selective MAOIs, alcohol, carbamazepine & other enzyme inducers, opioid agonist-antagonist eg, buprenorphine, nalbuphine, pentazocine; SSRIs, triptans, other opioid derivatives, benzodiazepines, barbiturates, CNS depressants, warfarin-like compd, CYP3A4 inhibitors eg, ketoconazole & erythromycin, drugs reducing seizure threshold.