Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Atazanavir interacts with many medications. One product that may interact with this drug is: indinavir.

Other medications can affect the removal of atazanavir from your body, which may affect how atazanavir works. Examples include boceprevir, etravirine, nevirapine, rifamycins (such as rifampin), St. John's wort, among others.

Atazanavir can slow down the removal of other medications from your body, which may affect how they work. Examples of affected drugs include some alpha blockers (such as alfuzosin), certain benzodiazepines (midazolam, triazolam), cisapride, ergot alkaloids (such as dihydroergotamine, ergotamine), fluticasone, irinotecan, pimozide, drugs to treat erectile dysfunction/pulmonary hypertension (such as sildenafil, vardenafil), certain "statin" cholesterol drugs (lovastatin, simvastatin), salmeterol, among others.

Prescription and nonprescription drugs to treat heartburn, indigestion, or ulcers (including H2 blockers such as famotidine, proton pump inhibitors such as omeprazole) reduce stomach acid and decrease the absorption of atazanavir. This may prevent atazanavir from working well. Ask your doctor or pharmacist how to use these medications safely.

This medication may decrease the effectiveness of hormonal birth control such as pills, patch, or ring. This could cause pregnancy. Discuss with your doctor or pharmacist the use of additional reliable birth control methods while using this medication. (See Notes section.) Also tell your doctor if you have any new spotting or breakthrough bleeding, because these may be signs that your hormonal birth control is not working well.

OVERDOSE: If overdose is suspected, contact a poison control center or emergency room immediately. US residents can call the US National Poison Hotline at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: severe dizziness, lightheadedness.

NOTES: Do not share this medication with others.

To decrease your risk of spreading HIV disease to others, always use an effective barrier method (latex or polyurethane condoms/dental dams) during all sexual activity. Consult your doctor or pharmacist for more details.

Laboratory and/or medical tests (such as viral load, T-cell counts, liver tests, cholesterol/triglyceride levels, blood sugar levels) should be performed periodically to monitor your progress or check for side effects. Consult your doctor for more details.

MISSED DOSE: It is important not to miss doses of this drug. If you miss a dose, take it as soon as you remember, unless it is less than 6 hours until the next dose. In that case, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.

STORAGE: Store at room temperature away from light and moisture. Do not store in the bathroom. Keep all medications away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company for more details about how to safely discard your product.

MEDICAL ALERT: Your condition can cause complications in a medical emergency. For information about enrolling in MedicAlert, call 1-800-854-1166 (US) or 1-800-668-1507 (Canada).

Information last revised April 2012. Copyright(c) 2012 First Databank, Inc.