High serum cholesterol concentrations are commonly seen in HIV-infected patients treated with some protease inhibitor medications as part of long-term antiretroviral therapy for HIV. There is concern that these elevations in cholesterol may negatively impact on long-term risk of cardiovascular disease in this patient population. Pravastatin, a HMG-CoA reductase inhibitor, is commonly used to treat hypercholesterolaemia in the general population. We aim to examine the effect of 12 weeks therapy with 40mg pravastatin daily in conjunction with dietary advice in HIV-infected patients with elevated serum cholesterol on continued protease inhibitor therapy.