What is Truvada HIV-prevention drug?
Truvada is a prescription medication that contains two active ingredients: emtricitabine and tenofovir disoproxil fumarate . It belongs to a class of drugs called nucleoside reverse transcriptase inhibitors (NRTIs) .
It is used for two main purposes:
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To treat HIV infection (always in combination with other antiretroviral medications) .
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For HIV PrEP (Pre-Exposure Prophylaxis) to reduce the risk of getting HIV in people who are at high risk .
📋 How It Works
Truvada works by blocking an enzyme called reverse transcriptase, which HIV needs to replicate (copy itself) within your body . By inhibiting this enzyme, the medication helps to:
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For treatment: Lower the amount of HIV in the blood (viral load) to undetectable levels, which allows the immune system to recover and prevents the progression of AIDS .
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For PrEP: Prevent the virus from establishing a permanent infection after a person has been exposed .
🩺 Uses and Effectiveness
Truvada is approved by the FDA for specific uses in adults and children who meet certain weight requirements :
| Use | Description |
|---|---|
| HIV Treatment | For people who already have HIV. It must be taken with at least one other HIV medication as part of a complete regimen . |
| HIV PrEP (Prevention) | For people who do not have HIV but are at substantial risk of getting it through sex or injection drug use. When taken daily, PrEP has been shown to reduce the risk of getting HIV from sex by about 99% . |
⚠️ Important Safety Information
Before taking Truvada, it is crucial to be aware of several serious risks and requirements :
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Must be HIV-negative for PrEP: Truvada can only be used for PrEP if you are confirmed to be HIV-negative. If you already have HIV and take Truvada alone (without other HIV drugs), the virus may become resistant to the medication, making it harder to treat in the future . An HIV test is required before starting PrEP and at least every 3 months while taking it .
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Worsening of Hepatitis B (HBV): Truvada is also active against HBV. If you have both HIV and HBV and stop taking Truvada, your hepatitis B infection may flare up severely. Your liver function will need to be monitored for several months after stopping the drug .
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Kidney Problems: Truvada can cause new or worsening kidney problems, including kidney failure. It can also cause Fanconi syndrome, a condition that affects how the kidneys absorb certain nutrients . Your healthcare provider should monitor your kidney function before and during treatment .
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Lactic Acidosis: This is a rare but serious build-up of lactic acid in the blood, which can be life-threatening. Symptoms include weakness, unusual muscle pain, trouble breathing, and stomach pain with nausea .
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Bone Problems: Truvada may cause a decrease in bone mineral density, leading to bone pain, softening of the bones (osteomalacia), or fractures .
💊 How to Take Truvada
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Standard Dosage: The usual dose for adults and children weighing at least 35 kg (77 lb) is one tablet (200 mg emtricitabine/300 mg tenofovir DF) once daily .
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Administration: It can be taken with or without food, but it is best to take it at the same time each day to maintain a consistent level in your blood .
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Dosage for Children: For children who weigh less than 35 kg, lower-strength tablets are available, and the dose is based on body weight .
📝 Alternatives and Related Drugs
Truvada is not the only option for HIV PrEP. Other approved medications include:
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Descovy (emtricitabine/tenofovir alafenamide): Another daily pill approved for PrEP for cisgender men and transgender women .
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Apretude (cabotegravir): A long-acting injection given every two months .
For Post-Exposure Prophylaxis (PEP)—taking medication after a possible exposure to HIV—Truvada is often used in combination with another drug (like dolutegravir or raltegravir) for 28 days