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New Drug Offers Promise as Single Treatment for HIV

An experimental antiretroviral drug designated "MK-0518" rapidly achieves sharp reductions in human immunodeficiency virus (HIV) levels, and may offer the prospect of single-//drug treatment for patients with HIV infection.

If the good results are borne out by further studies, "MK-0518 should clearly be a welcome addition to the existing treatment options for those persons infected with HIV-1," concludes the new study, led by Dr Martin Markowitz of The Rockefeller University, New York.

Thirty-five previously untreated patients with HIV infection were randomly assigned to receive one of four different doses of MK-0518, or to receive an inactive placebo. After 10 days of treatment, the patients' "viral load" was measured. The viral load is a key test that determines how well HIV—the virus that causes AIDS—is reproducing in the patient's body. At the start of the study, all patients had a relatively high viral load of 5,000 copies per milliliter of blood.

Patients taking MK-0518 had dramatic reductions in their viral load. After just 10 days of treatment, viral load decreased by an average of 98 percent (based on the logarithmic scale used to measure HIV levels).

The results were similar across all four MK-0518 dose groups. For most patients in each group, the viral load dropped to an "undetectable" level of less than 400 copies per milliliter.

Treatment with MK-0518 was "generally well tolerated," the authors write. Side effects such as headache and dizziness occurred, but there were no major adverse effects.

Although major advances have been made in drug treatment of HIV, new treatments are still needed for several reasons. Current approaches require complex combinations of drugs, with many short- and long-term toxic effects. Drug resistance is also an increasing problem, as new strains of HIV become resistant to the effects of current antiretroviral drugs.

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