Applied Evidence

HIV update: Which single-tablet regimens, and when

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With the approval of single-tablet regimens that contain 3 or 4 drugs, many patients take just one pill a day. So what are the options and what's on the horizon?


 

References

PRACTICE RECOMMENDATIONS

› Offer all patients with human immunodeficiency virus (HIV) disease antiretroviral therapy (ART) regardless of disease state or CD4 cell lymphocyte count. A
› Consider one of 6 recommended ART regimens for ART-naive patients. A
› Offer one of 6 alternative antiretroviral regimens to patients unable to tolerate one of the recommended regimens for reasons of toxicity, a pre-existing medical condition, or baseline viral resistance. B

Strength of recommendation (SOR)

A Good-quality patient-oriented evidence
B Inconsistent or limited-quality patient-oriented evidence
C Consensus, usual practice, opinion, disease-oriented evidence, case series

CASE James G, age 43, recently had blood work performed for a life insurance policy, and his human immunodeficiency virus (HIV) test came back positive. At a follow-up office visit, Mr. G reports having anonymous male sexual partners when traveling to New York on business and rarely using condoms. His last HIV test was “about 4 years ago.” He is otherwise in good health, takes no regular medications, and is not married.

Having recently completed a primary care CME program on HIV disease, you order a CD4/T-cell count, an HIV RNA (viral load) test, and an HIV genotype drug resistance test on Mr. G, along with other baseline lab work, including a complete blood count, chemistry panel, and hepatitis panel. You schedule a follow-up visit with Mr. G in 2 weeks when all of the lab results will be available so that you can discuss his plan of care.

A diagnosis of HIV has moved from being a fatal disease to that of a chronic condition that can be effectively managed with combination antiretroviral therapy (ART) regimens over an almost normal lifespan. As a result, the role of the primary care practitioner in the ongoing care of patients with HIV has grown and will continue to do so, making knowledge of these drug combinations vital.

20 years have changed everything

Combination ART has existed since 1996 when the first protease inhibitors (PIs) were approved by the US Food and Drug Administration (FDA). Prior to this, treatment was limited to mono or dual therapy with nucleoside reverse transcriptase inhibitors (NRTIs). These agents provided some short-term clinical benefit, but didn’t significantly improve patient survival and ultimately failed due to viral resistance.1

Since the approval of zidovudine (AZT) in 1987, the FDA has approved more than 25 drugs in 6 different classes for the treatment of HIV disease.2 These include the NRTIs, non-nucleoside reverse transcriptase inhibitors (NNRTIs), PIs, a fusion inhibitor (FI), a CCR5 antagonist, and, more recently, integrase strand transfer inhibitors (INSTIs). In addition, 2 drugs, cobicistat and ritonavir, are used solely to improve or “boost” the pharmacokinetic profiles of several antiretroviral drugs.2

Most of these newer agents are more potent, have a higher genetic barrier to resistance, and a longer half-life than their predecessors. Moreover, many are less toxic and thus more tolerable than older drugs. With the progressive development and approval of single-tablet regimens (STRs) that contain 3 or 4 drugs, the majority of patients with HIV in the United States now take just one pill per day to treat their infection, facilitating far greater medication adherence.

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