Tybost

A Smart + Strong Site
Subscribe to:
E-newsletters
POZ magazine
JOIN AIDSMEDS YouTube
AIDS virusTybost belongs to a class of anti-HIV drugs called Pharmacokinetic Enhancers. For a description of the life-cycle of the AIDS virus, and the targets of each class of drugs, click here.

Tybost is being developed by Gilead Sciences. They have a web site that includes the latest news & research reports on this and other drugs in development: click here.

AIDS drugs chartOur quick-reference chart allows you to compare all the currently available anti-HIV drugs, including dosing, side effects, & dietary restrictions.
news Treatment News
Search for recent news and archived stories about Tybost.
forumsHave more questions? Then post a question or comment in our Community Forums.
Help Paying for MedsHelp Paying for Meds: Patient assistance and co-pay programs for HIV and viral hepatitis drugs.
Lessons Our Lessons: Check out our informative Lessons covering various topics to help you make treatment decisions.
Collapse All

Recommended Reading List:

Books about AIDS & HIV treatmentsFor a list of great books about living with HIV and making informed treatment decisions, along with easy links to buy them from Amazon.com, click here.

Tybost (cobicistat)

Pronunciation(s):



What is Tybost?
  • Tybost (cobicistat) is a pharmacokinetic enhancer (a drug used to boost other medications in the blood to make them more effective) by Gilead Sciences. It is a stand-alone drug, for use in combination with either Reyataz (atazanavir) and Prezista (darunavir), and as a component of the fixed-dose combination tablet Stribild.
     
  • Tybost is not active against HIV. It works by inhibiting an enzyme called CYP3A4 that is responsible for breaking down (or metabolism) of certain medications, including several HIV drugs. This helps boost the effectiveness of these drugs, while allowing fewer pills or doses on a daily basis.
     
  • cobicistat was developed to be used in combination with other drugs.

What is already known about Tybost?
  • The Tybost dose is 150 mg, once a day, in combination with either Reyataz or Prezista. Stribid contains 150 mg cobicistat.
     
  • Compared with Norvir (ritonavir), an HIV protease inhibitor frequently used to boost other antiretrovirals, Tybost blocks fewer ezymes in the body responsible for breaking down (metabolizing) drugs, meaning that it will likely result in fewer drug-drug interactions. However, Tybost still interacts with a number of medications, including those used to treat HIV. It is important that your health care provider be aware of all drugs you are taking, including those you buy without a prescription.
     
  • Stribild contains cobicistat, the integrase inhibitor elvitegravir, tenofovir (found in Viread, Truvada, Complera and Atripla) and emtricitabine (found in Emtriva, Truvada, Complera and Atripla). Cobicistat is also being studied in fixed-dose combination tablets containing Reyataz and Prezista.

What about drug interactions?
  • Like the protease inhibitor Norvir (ritonavir), which is primarily used to boost blood levels of other HIV medications in the body, Tybost has a number of interactions with other (HIV and non-HIV) drugs. However, Tybost only affects the CYP3A4 enzyme, whereas Norvir interacts with CYP3A4 and others. Studies on potential interactions between cobicistat and other drugs are ongoing.

What is known about side effects?
  • According to clinical trials completed thus far, Tybost may cause gastrointestinal side effects, including nausea, vomiting and diarrhea. The drug may also exacerbate kidney impairment in some people.

Who should not take Tybost?
  • It is not known whether Tybost will harm an unborn baby. It is very important to treat HIV/AIDS during pregnancy to reduce the risk of infecting your baby. Talk to your doctor about your treatment options.
     
  • It is not known whether Tybost passes into breast milk and what effect it may have on a nursing baby. To prevent transmission of the virus to uninfected babies, it is recommended that HIV-positive mothers not breast-feed.

Where can I learn more about clinical trials of Tybost?
  • If you would like to find out if you are eligible for any clinical trials that include Tybost, visit ClinicalTrials.gov, a site run by the U.S. National Institutes of Health. The site has information about all HIV-related clinical studies in the United States. For more info, you can call their toll-free number at 1-800-HIV-0440 (1-800-448-0440) or email contactus@aidsinfo.nih.gov.

Last Revised: August 28, 2012

This content is written by the POZ and AIDSmeds editorial team. For more information, please visit our "About Us" page.


[ about AIDSmeds | AIDSmeds advisory board | our staff | advertising policy | advertise/contact us]
© 2014 Smart + Strong. All Rights Reserved. Terms of use and Your privacy.
Smart + Strong® is a registered trademark of CDM Publishing, LLC.