such as amitriptyline (Elavil, Vanatrip, Limbitrol), desipramine (Norpramin), doxepin (Sinequan), nortriptyline (Pamelor), paroxetine (Paxil), or sertraline (Zoloft). Taking any of these other conditions: heart rhythm medication such as nelfinavir (Viracept) or ritonavir (Norvir); an antibiotic such as sickle cell anemia, multiple myeloma, or leukemia; a bleeding blood