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Janssen launches once-daily, fixed-dose combination REZOLSTA® tablet for the treatment of HIV

Janssen has launched REZOLSTA®, a new single tablet, once-daily, fixed-dose combination containing darunavir (marketed as PREZISTA®) and the pharmacokinetic enhancing or “boosting” agent cobicistat (marketed as TYBOST® by Gilead Sciences, Inc.), indicated for use in combination with other antiretroviral medicinal products for the treatment of human immunodeficiency virus-1 (HIV-1) infection in adults aged 18 years or older with no darunavir resistance-associated mutations. (1) The availability of this treatment means that for the first time, patients are able to take darunavir, the UK’s most prescribed protease inhibitor (2), combined with a booster in only one tablet.

The availability of the darunavir/cobicistat combination treatment in the UK follows its authorisation by the European Medicines Agency (EMA), based on bioequivalence data for darunavir and cobicistat fixed-dose combination tablet versus single agents, and data evaluating the safety and efficacy of cobicistat-boosted darunavir. (3–5) The data demonstrated that once-daily darunavir/cobicistat offers effective virological suppression over 48 weeks and that a high genetic barrier to resistance of darunavir is retained with the cobicistat booster. (5,6)

Professor Anna Geretti, Department of Virology & Infectious Diseases at the Institute of Infection & Global Health of the University of Liverpool, commented:

The availability of this new formulation means that, for the first time, patients will be able to take a protease inhibitor and boosting agent once a day, in a single tablet, in combination with other required antiretroviral medicines. Reducing the pill burden in this way could increase patient adherence to treatment.

It is estimated that there are 100,000 people living with HIV in the UK and approximately 6,000 new diagnoses confirmed each year. (7) Thanks to treatment advances over the past 3 decades, HIV is no longer considered a fatal illness in developed countries. (8) However, adherence to treatment is essential in order to prevent low drug levels in the blood allowing the virus to become resistant to treatment. (9) Evidence demonstrates that 39% of patients show less than 90% adherence to their treatment regimen (10) and that after 8 months of treatment, only 65% of patients achieve 100% compliance. (9)

Studies have shown that the once-daily, single tablet darunavir/cobicistat combination, demonstrates a similar tolerability profile to darunavir. (3–5) The treatment was generally well tolerated over 48 weeks and only 5% of patients discontinued treatment due to adverse events. (11)

Janssen is dedicated to improving the lives of all people living with HIV and the simplification of treatment regimens can be an important aspect of this. We believe this convenient ‘one tablet, once daily’ regimen will be a valuable addition to the options available to prescribers and, most importantly, to their patients,” commented Peter Barnes, Medical Director at Janssen.

Janssen will continue to make darunavir available, as a single agent in tablets, so patients and their physicians can decide which HIV treatment regimen is best for them.


  1. REZOLSTA® Summary of Product Characteristics.
  2. Janssen Data on file, September 2014 – IMS data, September 2014.
  3. Orkin C et al. HIV Med 2012; 14: 49–59.
  4. Cahn P et al. AIDS 2011; 25: 929–39.
  5. Kakuda TN et al. Antivir Ther 2014; doi: 10.3851/IMP2814. [Epub ahead of print]
  6. Johnson VA et al. Top HIV Med 2010; 18: 156–63.
  7. Health Protection Agency. 2013. HIV in the United Kingdom: 2013 Report. Available at:  (November 2014)
  8. The Antiretroviral Therapy Cohort Collaboration. 2008. Life expectancy of individuals on combination antiretroviral therapy in high-income countries: a collaborative analysis of 14 cohort studies. The Lancet 372: 293–9.
  9. Mannheimer S et al. Clinical Infectious Diseases 2002; 34: 1115–21.
  10. Ortego C et al. AIDS Behav 2011; 15: 1381–96.
  11. REZOLSTA® Data on file, September 2014.

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