An Overview of Retrovir (Zidovudine, AZT)

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Brand Name: Retrovir
Other Name(s): AZT, ZDV, azidothymidine
Drug Class: Nucleoside Reverse Transcriptase Inhibitors
Approved Use: Treatment of HIV Infection; Prevention of Mother-to-Child Transmission of HIV

What is zidovudine?

Zidovudine is a prescription medicine approved by the U.S. Food and Drug Administration (FDA) for the following uses:

• Treatment of HIV infection in adults and children 4 weeks of age and older. When zidovudine is used to treat HIV infection, the medicine is always used in combination with other anti-HIV medicines.
• Prevention of mother-to-child transmission of HIV in pregnant HIV-infected women and their infants.

Zidovudine is a type of anti-HIV medicine called a nucleoside reverse transcriptase inhibitor (NRTI). NRTIs work by blocking HIV reverse transcriptase, an HIV enzyme. This prevents HIV from replicating and lowers the amount of HIV in the blood.

Zidovudine does not cure HIV/AIDS. Despite use of zidovudine to prevent mother-to-child transmission of HIV, some cases of HIV infection can still occur.

What should I tell my health care provider before taking zidovudine?

Before taking zidovudine, tell your health care provider:

• If you are allergic to zidovudine or any other medicines.
• If you have or have ever had liver or kidney disease.
• If you have or have ever had bleeding, anemia, or other blood problems.
• If you have or have ever had any disease or swelling of the muscle.
• If you have or have had any other medical conditions.
• If you drink alcohol or have a history of alcohol abuse.
• If you are pregnant or plan to become pregnant. Despite use of zidovudine to prevent mother-to-child transmission of HIV, some cases of HIV infection can still occur. Whether exposure to zidovudine in the womb or after birth can harm a baby in the long term is unknown.
• If you are breastfeeding or plan to breastfeed. Do not breastfeed if you are infected with HIV or are taking zidovudine.
• About other prescription and nonprescription medicines, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Zidovudine may affect the way other medicines or products work, and other medicines or products may affect how zidovudine works. Taking zidovudine together with certain medicines or products may cause serious and/or life-threatening side effects.

How should I take zidovudine?

Zidovudine comes in the following forms and strengths:

• 300-mg tablets (brand name: Retrovir).
• 100-mg capsules (brand name: Retrovir).
• 10-mg/mL syrup (brand name: Retrovir).
• 10-mg/mL concentrate for intravenous infusion (brand name: Retrovir).

Take zidovudine according to your health care provider's instructions.

Take zidovudine tablets, capsules, and syrup with or without food.

Before use, zidovudine concentrate for intravenous infusion is diluted with dextrose (sugar dissolved in water). The diluted concentrate is given through a needle into a vein.

If you take too much zidovudine, contact your local poison control center (1-800-222-1222) or go to the nearest hospital emergency room right away.

For more information on how to take zidovudine tablets, capsules, and syrup, see the FDA drug label from DailyMed. (DailyMed is a federal website that includes the most recent drug labels submitted to FDA.) For more information on how to take zidovudine intravenous infusion, see the drug summary from MedlinePlus.

What should I do if I forget a dose?

If you are taking zidovudine by mouth (tablets, capsules, or syrup) and forget a dose, take the missed dose as soon as you remember it. But if it is almost time for your next dose, skip the missed dose and just take your next dose at the regular time. Do not take two doses at the same time to make up for a missed dose.

If you or your child is taking the zidovudine by infusion, your health care provider may tell you to stop the infusion if you or your child has a mechanical problem (such as blockage in the tubing, needle, or catheter). If you have to stop an infusion, call your health care provider immediately so your therapy can continue after the problem is resolved.

What side effects can zidovudine cause?

Zidovudine can cause serious, life-threatening side effects. These include lactic acidosis (buildup of acid in the blood), liver problems, and blood disorders, including severe anemia. Use of zidovudine for a long time can cause muscle weakness. (See the WARNING above).

Other possible side effects of zidovudine include:

• Changes in the immune system (immune reconstitution inflammatory syndrome).
• Changes in body fat (lipodystrophy).

Tell your health care provider if you have any side effect that bothers you or that does not go away.

These are not all the possible side effects of zidovudine. Ask your health care provider or pharmacist for more information on possible side effects of zidovudine.

How should zidovudine be stored?

• Store zidovudine tablets, capsules, and oral solution at 59°F to 77°F (15°C to 25°C). Protect zidovudine capsules from moisture.
• Once zidovudine concentrate for intravenous infusion is diluted, use the solution within 8 hours if stored at 59°F to 77°F (15°C to 25°C) or 24 hours if refrigerated at 36°F to 46°F (2°C to 8°C).
• Safely throw away zidovudine that is no longer needed or expired (out of date).
• Keep zidovudine and all medicines out of reach of children.

Where can I find more information about zidovudine?

More information about zidovudine is available:

• The zidovudine drug label, from DailyMed. The Patient Counseling Information section of the label includes information for people taking zidovudine tablets, capsules, and syrup.
• The zidovudine drug summary from MedlinePlus includes information for people taking zidovudine intravenous infusion.
• Zidovudine-related research studies, from the AIDSinfo database of ClinicalTrials.gov study summaries.
• A list of FDA-approved generics for anti-HIV medicines, from FDA.

Manufacturer Information

GlaxoSmithKline
888-825-5249