Additive effect w/ MAOIs (eg, selegiline HCl, rasagiline mesilate); linezolid. Possible serious adverse reactions including serotonin syndrome w/ pethidine- & tramadol HCl-containing products or tapentadol HCl. Additive or synergistic effects w/ TCAs (eg, amitriptyline HCl, amoxapine, imipramine HCl, clomipramine HCl, dosulepin HCl, trimipramine maleate, nortriptyline HCl, lofepramine HCl), tetracyclic antidepressants (eg, maprotiline HCl, mianserin HCl, setiptiline maleate). Increased brain serotonin conc w/ SSRIs (eg, fluvoxamine maleate, paroxetine HCl hydrate, sertraline HCl, escitalopram oxalate); trazodone HCl. Increased brain monoamine total amount w/ SNRIs (eg, milnacipran HCl, duloxetine HCl, venlafaxine HCl), atomoxetine HCl; mirtazapine; CNS stimulants eg, methylphenidate HCl, lisdexamfetamine mesilate. Reduced effect w/ reserpine derivatives, phenothiazines, chlorpromazine, butyrophenones, haloperidol, sulpiride, metoclopramide. Serotonin syndrome w/ dextromethorphan HBr hydrate. Enhanced sympathomimetic effect of sympathomimetic agents eg, ephedrine HCl, methylephedrine HCl, pseudoephedrine HCl- & phenylpropanolamine-containing drugs.