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AIDS and HIV Information

AIDS and HIV Information

Tivicay and Truvada

Tivicay and Truvada


The updated HIV guidelines from the Department of Health and Human Services (DHSS) list the combination of Truvada and Tivicay as a recommended regimen for most people with HIV. Official treatment guidelines are made available to help patients and healthcare providers make an informed decision about when to start treatment, which regimen to choose, when to stop, and when to switch to a new antiretroviral therapy (ART). By 2015, all internationally written guidelines were updated in accordance to the newly released guidelines by the World Health Organization (WHO)—and that is to offer treatment to all people living with HIV, regardless of their CD4 T-cell count.

Indications for Tivicay and Truvada combo

Aside from treating HIV-1 infection, the combination regimen is also approved for post exposure prophylaxis (PEP). The drugs in Tivicay and Truvada are all commercially available in separate preparations. The integrase inhibitor-based regimen is recommended by the DHSS as first line treatment for treatment-naïve patients. Being included in the “recommended” list means these drugs have demonstrated powerful and long-lasting efficacy, with fewer side effects, and were easy to take. Each of the antiretroviral agents contained in this combo, and their actions, are discussed below:

  • Dolutegravir (Tivicay) – this drug is manufactured by ViiV Healthcare and is the third drug from the class of integrase strand transfer inhibitors (INSTI). It was approved by the FDA in 2013. HIV infects the body by combining its genetic code into the immune cell’s own code. This drug blocks the function of the enzyme integrase, thus preventing the strand transfer activity. The viral enzyme is involved in the process of replication. In clinical trials, dolutegravir causes significant reduction in HIV RNA levels and increase of CD4 T cell count. The potent INSTI is available as 50mg tablets under the brand name Tivicay. It is used in combination with other drugs to treat HIV.
  • Emtricitabine (Emtriva) – emtricitabine, also known as FTC, is manufactured by Gilead Sciences. It belongs to the drug class nucleoside analog reverse transcriptase inhibitor or nuke. This drug blocks the action of reverse transcriptase enzyme, the viral enzyme responsible for changing HIV’s genetic material (RNA) into its DNA form. By blocking this enzyme, the virus fails to insert its genetic code into the infected cell’s own code. Emtricitabine is also effective against hepatitis B virus, and is part of combination drugs such as Truvada, Descovy, Complera, Odefsey, Genvoya, and Stribild.
  • Tenofovir disoproxil fumarate (Viread) – Tenofovir DF is a widely used agent in antiretroviral therapies. Just like emtricitabine, it is manufactured by Gilead Sciences, and works as a “nuke.” In October 2001, it was granted FDA approval for treating people with HIV. It is also contained in Truvada for post-exposure prophylaxis. The advantage of TDF is that is has very little cross-resistance with other antiretroviral agents. In fact, it works against several HIV strains that are already resistant to some HIV meds like zidovudine and didanosine.

Tivicay and Truvada for PEP

Post-exposure prophylaxis is a preventive tool for people who have been in contact with the virus, provided the exposure occurs within 72 hours. This prevents the virus from establishing itself in the body and causing chronic infection. Timing is very important for PEP to work because once the virus proliferates in the person’s immune system, it becomes a full-blown infection with no known cure to date. PEP requires taking an antiretroviral regimen following an HIV exposure (e.g., unprotected sex with a person with HIV). The standard regimen for PEP is one daily tablet of Truvada taken by mouth and one 50 mg Tivicay once a day; patients take a total of two pills per day for 28 days. However, this regimen is not recommended for women of childbearing potential because Tivicay is toxic in early pregnancy.

To be effective, PEP regimen must be started immediately, not longer than 72 hours from the time of exposure. While it can prevent HIV infection when taken correctly, it is not 100% effective. In animal studies, PEP has protected macaque monkeys from intravenous and intravaginal exposure to the virus when started within 24 and 36 hours, respectively. The study also demonstrated that there were increasing rates of failure if antiretroviral regimen is started within 48–72 hours after exposure. Half of the monkeys treated in this timeframe were persistently infected.

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