Genvoya and Stribild

Common side effects include nausea and diarrhea. INSTIs and TAF have been associated with weight gain. Cobicistat can cause a small, reversible increase in serum creatinine within the first few weeks of treatment without affecting actual kidney function. While cobicistat does not affect actual kidney function, its effect on SCr can make monitoring of impaired kidney function more difficult or less accurate. INSTIs have been associated with adverse neuropsychiatric effects (such as sleep disturbances, depression, anxiety, suicidal ideation) in some retrospective cohort studies and case series. HHS guidelines recommend closely monitoring people on an INSTI who have pre-existing psychiatric conditions. Prior to initiation, people should be tested for hepatitis B virus (HBV) infection. Severe exacerbations of HBV have been reported in people co-infected with HBV who have discontinued Genvoya or Stribild (due to elimination of the emtricitabine and tenofovir components, which also treat hepatitis B). Monitor liver enzymes closely in co-infection. HBV therapy may be warranted upon discontinuation. Call your health care provider right away if you develop any of the following signs of hepatitis: yellowing of the skin or whites of the eyes; dark or tea-colored urine; pale-colored bowel movements; nausea or vomiting; loss of appetite; or pain, aching, or tenderness on the right side below the ribs.

Before taking Genvoya or Stribild, kidney function testing should be conducted, including serum creatinine (SCr), serum phosphorus, urine glucose, and urine protein. These measurements should continue to be monitored while taking Genvoya or Stribild.

Do not take with Cimduo or Temixys, Descovy, Emtriva, Epivir-HBV, Hepsera, Truvada, Vemlidy, or Viread all for the treatment of hepatitis B, as the emtricitabine and tenofovir components already treat HBV. Separate by at least 2 hours from antacids containing aluminum, magnesium hydroxide, or calcium carbonate. Safe to take with other medications used for heartburn and GERD such as Aciphex, Dexilant, Nexium, Pepcid, Prevacid, Prilosec, and Zantac. Cobicistat has many drug interactions similar to Norvir. Do not take with lovastatin or simvastatin, alfuzosin, carbamazepine, phenobarbital, phenytoin, ergotamine, dihydroergotamine, methyl-ergonovine, oral midazolam, lurasidone, pimozide, Revatio, rifampin, rifabutin, rifapentine, Serevent, triazolam, St. John’s wort, clopidogrel, or ticagrelor. Rosuvastatin and atorvastatin should be used with caution and started at the lowest dose possible. Monitor closely for increased side effects, such as muscle pain, from these medications. An alternative corticosteroid to systemic dexamethasone should be considered. Risks versus benefits of using with voriconazole should be assessed with expert consultation. Concentrations of antidepressants such as fluoxetine, paroxetine, bupropion, or amitriptyline may be increased, and their doses may need to be reduced. Levels of many nasal and inhaled steroids like fluticasone may be increased, which may lead to symptoms of Cushing’s syndrome. No significant interactions with beclomethasone or prednisolone. Use caution with beta blockers and calcium channel blockers. An alternative corticosteroid is recommended. Cialis, Levitra, and Viagra levels are increased; doses should not exceed 10 mg Cialis or 2.5 mg Levitra per 72 hours, or 25 mg Viagra per 48 hours. Monitor for increased side effects of these medications. Effectiveness of oral contraceptives may be decreased; consider using alternative or additional contraception methods. Start metformin at lowest dose and titrate based on tolerability and clinical effect. Reduce Daklinza dose to 30 mg. Taking with Olysio, Viekira Pak, or Zepatier is not recommended. Take lower dose of colchicine. Tell your provider or pharmacist about all medications, herbals, and supplements you are taking or thinking of taking, prescribed or not, as there are many other drug interactions not listed here.

Genvoya: Dose of clarithromycin may need to be reduced based on kidney function. Can be taken with Harvoni or Epclusa.

Stribild: Co-administer bosentan and immunosuppressants such as Prograf, Gengraf, Neoral, and Sandimmune with caution. Taking with Harvoni, Olysio, Viekira Pak, or Zepatier is not recommended. Monitor kidney function more closely with Epclusa.

Switching regimens should be considered for anyone who is pregnant, especially during the third trimester, due to lower drug levels. Pregnant individuals can voluntarily enroll in the Antiretroviral Pregnancy Registry through their provider; GO TO apregistry.com

Dr. Melanie Thompson:

These STRs differ only in the presence of TAF (Genvoya) or TDF (Stribild), but neither is recommended for initial therapy for most people because elvitegravir requires a cobicistat booster, introducing many drug-drug interactions, and because of elvitegravir’s genetic fragility compared to dolutegravir and bictegravir. When taken together, TDF and COBI sometimes have been associated with kidney toxicity and low bone density, so close monitoring is important. These drugs should not be used in pregnancy due to the risk of inadequate drug levels associated with cobicistat in the second and third trimesters.

Activist Joey Wynn:

Gilead’s strategy to revise and update the Stribild combo by switching out the TDF with TAF to make Genvoya enabled them to continue its market domination. It’s a shrewd strategy that has worked for years, but at this point, no one should be on a boosted therapy, unless you have discussed it with your provider and there are no better options for you.