Risk of serotonin syndrome w/ MAOIs including linezolid. May inhibit metabolism of CYP450 drugs. Increase AUC of ramelteon. Concomitant use w/ drugs w/ narrow therapeutic index (eg, tacrine, theophylline, methadone, mexiletine, phenytoin, carbamazepine & cyclosporine). Increased plasma levels of TCAs (eg, clomipramine, imipramine, amitriptyline) & neuroleptics (eg, clozapine, olanzapine, quetiapine), benzodiazepines (eg, triazolam, midazolam, alprazolam & diazepam), caffeine. Increase plasma conc of ropinirole, propranolol & warfarin. Increased risk of QT-prolongation/Torsade de Pointes w/ terfenadine, astemizole or cisapride. Enhanced serotonergic effects w/ other serotonergic agents (eg, triptans, tramadol, SSRIs & St. John's wort prep) & lithium. Increased risk of haemorrhage w/ oral anticoagulants. Alcohol.