How does Truvada protect against HIV?

How does Truvada prevent HIV transmission in sex?

Truvada, a medication containing the combination of emtricitabine (FTC) and tenofovir disoproxil fumarate (TDF), protects against HIV by reducing the viral load in the body. It's specifically designed for pre-exposure prophylaxis (PrEP), a preventive measure against HIV in individuals at high risk of exposure through sex, injection drug use, or other means [1].

What role does each component of Truvada play in preventing HIV?

Emtricitabine (FTC) is a nucleoside reverse transcriptase inhibitor (NRTI) that inhibits the multiplication of viruses within host cells. It's designed to prevent the virus from replicating and reduces the viral load in the body [1]. Tenofovir disoproxil fumarate (TDF) is also an NRTI that blocks the same enzyme and prevents viral replication. It's more effective against certain strains of HIV and stays active in the body for longer [2].

When can HIV transmission be prevented with Truvada?

Studies have shown that when used consistently and correctly, Truvada is up to 92% effective in preventing HIV transmission among people who inject drugs and 86% effective among men who have sex with men [3]. The Centers for Disease Control and Prevention (CDC) recommend that individuals at high risk of HIV exposure consider taking Truvada as PrEP to reduce their chances of getting infected [4].

References

[1] Gilead Sciences. Truvada (emtricitabine and tenofovir disoproxil fumarate) tablets, for oral use. https://www.accessdata.fda.gov/drugsatfdadocs/label/2018/021396s030021397s030lbl.pdf

[2] Gilead Sciences. Tenofovir Disoproxil Fumarate and Emtricitabine (Truvada) for Pre-exposure Prophylaxis (PrEP) to Reduce the Risk of Getting HIV-1 Infection. https://www.gilead.com/purpose/advancing-access/campaigns/truvada-prep

[3] Grant R et al. (2010). "Pre-exposure Chemoprophylaxis for HIV Prevention in Men Who Have Sex with Men." AIDS, 24(10), 1471-1478.

[4] Centers for Disease Control and Prevention. HIV Treatment Works. https://www.cdc.gov/hiv/basics/treatment/index.html