Two of the most commonly prescribed drugs for treating HIV (antiretroviral drugs)--nevirapine and efavirenz--can both raise levels of the "good type" of cholesterol (HDL cholesterol), but nevirapine raises it higher than efavirenz, according to a new study by van Leth and colleagues published in the launch issue of PLoS Medicine. "These data suggest that nevirapine may be preferable to efavirenz in HIV-infected adults who have increased cardiovascular risk," says Andrew Carr, an HIV specialist at St. Vincent's Hospital in Sydney, Australia, who was not involved in the study. Cardiovascular risk factors include high blood pressure, diabetes, and smoking, which put patients at higher risk of heart disease and stroke.

However, perceived cardiovascular risk is only one factor that would affect the choice between these two drugs, notes Carr. Efavirenz is thought to be marginally better than nevirapine at keeping HIV infection under control; efavirenz is also advantageous because patients only need to take it once a day, whereas nevirapine must be taken twice daily. The new study "moves clinicians and patients away from 'one-size-fits-all antiretroviral therapy,'" says Carr, allowing them to weigh up the different advantages and disadvantages of each drug.

In the study, the researchers compared the cholesterol levels in 417 patients with HIV who were taking nevirapine against 289 patients who were taking efavirenz. None of the patients had been on any antiretroviral drugs before. Patients taking nevirapine had a significantly larger increase in HDL cholesterol compared with patients taking efavirenz.

Although the increase was higher with nevirapine, this does not prove that nevirapine is better at reducing the risk of heart disease and strokes, says Carr. The researchers did not look at the risk of these diseases in their study.

Praphan Phanuphak, of the Thai Red Cross AIDS Research Center in Bangkok, Thailand, who was one of the
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Contact: Paul Ocampo
pocampo@plos.org
415-624-1224
Public Library of Science
18-Oct-2004

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