Not to be used concurrently w/ entacapone. Antihypertensives, antidepressants, MAO-A inhibitors, TCA, desipramine, maprotiline & venlafaxine, rimiterol, isoprenaline, adrenaline, noradrenaline, dopamine, dobutamine, α-methyldopa, apomorphine & paroxetine. Dopamine receptor antagonists, phenytoin & papaverine, S-warfarin, high-protein diet, Fe prep (take at least 2-3 hr apart).