Hypersensitivity. Patients taking products inhibiting monoamine oxidases A or B (eg, phenelzine, isocarboxazid, selegiline, moclobemide) or w/in 2 wk of taking any such product. Patients w/ uncontrolled HTN; pheochromocytoma; thyrotoxicosis; bipolar disorder; schizoaffective disorder; acute confusional state; carcinoid syndrome. Patients taking directly & indirectly acting sympathomimetic agents (eg, pseudoephedrine), vasopressive agents (eg, epinephrine, norepinephrine), dopaminergic agents (eg, dopamine, dobutamine); serotonin re-uptake inhibitors, TCAs, serotonin 5HT1 receptor agonists (triptans), meperidine, bupropion, or buspirone.