Atazanavir and cobicistat is a combination medicine given together with other antiviral medicines to treat human immunodeficiency virus (HIV) in adults. HIV is the virus that can cause acquired immunodeficiency syndrome (AIDS). This medicine is not a cure for HIV or AIDS.

Atazanavir and cobicistat is for use in adults and children who weigh at least 77 pounds (35 kilograms).

Atazanavir and cobicistat may also be used for purposes not listed in this medication guide.

You should not take atazanavir and cobicistat if you are allergic to it.

Many drugs can interact and cause dangerous effects. Some drugs should not be used together with atazanavir and cobicistat. Your doctor may change your treatment plan if you also use:

• alfuzosin;
• cisapride;
• colchicine;
• drospirenone and ethinyl estradiol (birth control pills);
• irinotecan;
• oral midazolam, triazolam;
• pimozide;
• rifampin;
• sildenafil (Revatio, for treating pulmonary arterial hypertension);
• St. John's wort;
• antipsychotic medicine--lurasidone, pimozide;
• cholesterol lowering medicine--lomitapide, lovastatin, simvastatin;
• ergot medicine--dihydroergotamine, ergotamine, ergonovine, methylergonovine;
• heart medication--dronedarone, ranolazine;
• hepatitis C antivirals--elbasvir and grazoprevir, glecaprevir and pibrentasvir;
• other HIV medicines--indinavir, nevirapine; or
• seizure medicine--carbamazepine, phenobarbital, phenytoin.

Tell your doctor if you have ever had:

• heart disease;
• liver disease (especially hepatitis B or C);
• a bleeding or blood clotting disorder such as hemophilia;
• diabetes; or
• kidney disease (or if you are on dialysis).

Do not use if you are pregnant. Atazanavir and cobicistat may not work as well if you take it during pregnancy. You may also develop a serious condition called lactic acidosis if you take atazanavir and cobicistat with certain other HIV medicines during pregnancy. Tell your doctor right away if you become pregnant. You may need to use a different antiviral medicine.

Use your medications properly to control your infection. HIV can be passed to your baby if the virus is not controlled during pregnancy. Your name may be listed on a registry to track any effects of antiviral medicine on the baby.

Atazanavir and cobicistat can make hormonal birth control less effective, including birth control pills, injections, implants, skin patches, and vaginal rings. To prevent pregnancy while using this medicine, use a barrier form of birth control: condom, diaphragm, cervical cap, or contraceptive sponge.

Women with HIV or AIDS should not breastfeed a baby. Even if your baby is born without HIV, the virus may be passed to the baby in your breast milk.

Use Atazanavir And Cobicistat (Evotaz) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

• severe dizziness, irregular heartbeats;
• high blood sugar--increased thirst, increased urination, dry mouth, fruity breath odor;
• liver or gallbladder problems--upper stomach pain, nausea, vomiting, itching, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
• a severe skin reaction--fever, flu-like symptoms, mouth sores, muscle or joint pain, swelling in your face, burning eyes, skin pain, blistering, warmth or redness under your skin; or
• signs of a kidney stone--pain in your side or lower back, painful or difficult urination, blood in your urine.

You may need to stop taking this medicine permanently if you have a severe skin reaction.

Atazanavir and cobicistat affects your immune system, which may cause certain side effects (even weeks or months after you've taken this medicine). Tell your doctor if you have:

• signs of a new infection--fever, night sweats, swollen glands, cold sores, cough, wheezing, diarrhea, weight loss;
• trouble speaking or swallowing, problems with balance or eye movement, weakness or prickly feeling; or
• swelling in your neck or throat (enlarged thyroid), menstrual changes, impotence.

Common side effects may include:

• rash;
• jaundice; or
• changes in the shape or location of body fat (especially in your arms, legs, face, neck, breasts, and waist).

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Using this medicine may not prevent your disease from spreading. Do not have unprotected sex or share razors or toothbrushes. Talk with your doctor about safe ways to prevent HIV transmission during sex. Sharing drug or medicine needles is never safe, even for a healthy person.