You should not take this medication if you are allergic to atazanavir.
Do not take atazanavir together with cisapride (Propulsid), ergotamine (Ergomar, Cafergot), dihydroergotamine (D.H.E. 45, Migranal Nasal Spray), ergonovine (Ergotrate), methylergonovine (Methergine), indinavir (Crixivan), irinotecan (Camptosar), lovastatin (Mevacor, Altocor), simvastatin (Zocor), pimozide (Orap), midazolam (Versed), triazolam (Halcion), rifampin (Rifadin, Rimactane, Rifater), or St. John’s wort.
There are many other medicines that can interact with atazanavir. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor. Keep a list with you of all the medicines you use and show this list to any doctor or other healthcare provider who treats you.
Before using atazanavir, tell your doctor if you have liver disease (including hepatitis B or C), kidney disease (or if you are on dialysis), diabetes, a bleeding disorder such as hemophilia, a heart condition called "AV block,” or if you have ever used a protease inhibitor in the past.
Taking this medication will not prevent you from passing HIV to other people. Talk with your doctor about safe methods of preventing HIV transmission during sex. Sharing drug or medicine needles is never safe, even for a healthy person.