<p>Increased risk of bleeding with aspirin, NSAIDs, warfarin and other drugs that affect coagulation. Increased CNS effects with centrally-acting drugs (e.g. clomipramine). Increased risk of serotonin syndrome and NMS-like reactions with serotonergic drugs (e.g. tramadol), SSRIs, other selective serotonin-norepinephrine reuptake inhibitors, 5-HT1 receptor agonists (e.g. sumatriptan), antipsychotic agents and other dopamine antagonists. May inhibit antihypertensive effect of clonidine. May potentiate adverse haemodynamic effects with digoxin. Paroxysmal HTN and cardiac arrhythmia may occur when taken concurrently with epinephrine or norepinephrine.</p>