Amphetamines and derivatives 3,4-methylenedioxymethamphetamine (Ecstasy) Dextroamphetamine Methamphetamine Sibutramine (Meridia) Analgesics Cyclobenzaprine (Flexeril) Fentanyl (Duragesic) Meperidine (Demerol) Tramadol (Ultram) Antidepressants/mood stabilizers Buspirone (Buspar) Lithium Monoamine oxidase inhibitors (e.g., phenelzine [Nardil]) Selective serotonin reuptake inhibitors (e.g., fluoxetine [Prozac]) Serotonin-norepinephrine reuptake inhibitors (e.g., venlafaxine [Effexor]) Serotonin 2A receptor blockers (e.g., trazodone) St. John's wort (Hypericum perforatum) Tricyclic antidepressants (e.g., amitriptyline, nortriptyline [Pamelor]) Antiemetics Metoclopramide (Reglan) Ondansetron (Zofran) Antimigraine drugs Carbamazepine (Tegretol) Ergot alkaloids Triptans Valproic acid (Depakene) Miscellaneous Cocaine Dextromethorphan Linezolid (Zyvox) L-tryptophan 5-hydroxytryptophan