By: Marcus J. Hopkins, Blogger
In two separate posts in 2016, HEAL Blog covered the complex world of treating Hepatitis C (HCV) infections in people co-infected with HIV. While both HIV and HCV treatment regimens have reached groundbreaking levels over the past decade, negative drug interactions between regimens to treat the two conditions still leaves something to be desired.
A recent study published in the Journal of Hepatology found that one of the most popular drugs to treat HCV, Sovaldi (sofosbuvir, Gilead), can have serious drug interactions when used in combination with Viread (tenofovir disoproxil, Gilead), as well as other drugs used to treat HIV (Semedo, 2016 & Shen, 2016). The primary issue discovered by this study (as well as other studies) is that Sovaldi and other Direct-Acting Agents (DAAs) containing sofosbuvir, such as Harvoni (Gilead) and Epclusa (Gilead), can cause liver or kidney toxicity when co-administered with Viread and other HIV drugs. This is of particular concern, as one of the main health issues caused by HCV is liver fibrosis.
The study’s co-author, Bingfang Yan (Ph.D.) suggests that a potential method of getting around this counterindication would be to administer the regimens at different times, or by using different delivery methods (e.g. – administering the HIV regimen first, or through the skin, and the HCV regimen taken orally at a different time).
One issue facing both physicians and patients is that only a handful of long-term or longitudinal studies have been conducting, meaning that both physicians and patients have only counterindication warnings to go upon, that only suggest potential side effects may occur without definitive scientific proof. This can create considerable consternation for all parties involved, as one recommendation is clear: HIV treatment should not be suspended in order to treat HCV infections. The nature of HIV is such that ceasing regimens can lead the virus to develop immunities to the components of the therapy, meaning that a new treatment option will need to be selected. While the negative side effects of HIV drugs has eased over the past thirty years, each patient’s individual body chemistry is unique, and it can take time to find the right regimen for each patient.
A fantastic resource for checking counter-indications between HIV and HCV drugs is HEP Drug Interactions, a project of the University of Liverpool in the United Kingdom. This free website allows users to use the HEP Drug Interaction Checker to see which HCV regimens have counter-indications with drugs to treat virtually any medical condition. The site is sponsored by Janssen, Gilead, Merck, Bristol-Myers Squibb, and AbbVie, each of which make drugs to treat HCV. The site also offers mobile apps for both Apple and Android devices, where users can access the same HEP Drug Interaction Checker information that is available on the full site.
- Semedo, D. (2016, December 20). Hepatitis C Therapy Sovaldi Can Adversely Interact with HIV Therapy Viread, Study Says. Dallas, TX: Hepatitis News Today: BioNews Services, LLC. Retrieved from: https://hepatitisnewstoday.com/2016/12/20/hepatitis-c-therapy-sovaldi-adversely-interact-hiv-drug-viread/
- Shen, Y. & Yan, B. (2016, November). Covalent inhibition of carboxylesterase-2 by sofosbuvir and its effect on the hydrolytic activation of tenofovir disoproxil. Oxford, UK: Journal of Hepatology. Retrieved from: http://www.journal-of-hepatology.eu/article/S0168-8278(16)30702-4/abstract
Disclaimer: HEAL Blogs do not necessarily reflect the views of the Community Access National Network (CANN), but rather they provide a neutral platform whereby the author serves to promote open, honest discussion about Hepatitis-related issues and updates. Please note that the content of some of the HEAL Blogs might be graphic due to the nature of the issues being addressed in it.