The FDA issued an Early Communication about recent findings of The Data Collection on Adverse Events of Anti-HIV Drugs Study. Data analyses from this study indicate a higher risk of heart attack in patients infected with HIV-1 who were taking Ziagen (abacavir) or Videx (didanosine) as part of their drug therapy. The study is a large observational study of 33,347 HIV-1 infected patients living in North America, Europe and Australia. Patients in this study are being followed to evaluate the short and long term adverse effects of treatment with anti-HIV drugs. FDA continues to evaluate the overall risks and benefits of abacavir and didanosine. This evaluation may result in the need to revise labeling for the products. Until the FDA’s review is complete, health care professionals should evaluate the potential risks and benefits of each HIV-1 antiretroviral drug their patients are taking.

This early communication is in keeping with FDA’s commitment to inform the public about its ongoing safety reviews of drugs. As soon as this review is complete, FDA will communicate the conclusions and recommendations to the public.

Read the complete 2008 MedWatch Safety Summary, including a link to the FDA Early Communication About an Ongoing Safety Review regarding this issue at: http://www.fda.gov/medwatch /safety/2008/safety08.htm #abacavir