Primary Prophylaxis of Cerebral Toxoplasmosis in HIV-Infected Patients

Inclusion Criteria Concurrent Medication: Allowed: Zidovudine (AZT), didanosine (ddI), dideoxycytidine (ddC), erythropoietin (Eprex), other agents granted Treatment IND or expanded access status. Investigational triazoles. Pentamidine for primary prophylaxis of Pneumocystis carinii pneumonia (PCP). Patients with the following are excluded: History of cerebral toxoplasmosis or toxoplasmosis infection in any other organ or tissue. Focal neural abnormalities (except peripheral neuropathy) or mass lesions on a previous computerized tomography (CT) scan or magnetic resonance image (MRI), unless subsequent workup rules out toxoplasmosis, in which case abnormalities must have been stable for at least 2 months. Known or suspected allergy or severe intolerance to study drugs. Patients must have: Positive toxoplasma serology. HIV infection. Willingness and ability to comply with the protocol and capability of giving written informed consent. Exclusion Criteria Co-existing Condition: Patients with the following conditions or symptoms are excluded: Current diagnosis of cerebral toxoplasmosis or toxoplasmosis infection in any other organ or tissue. Known or suspected allergy or severe intolerance to study drugs. Concurrent Medication: Excluded: Anticoagulants. Other antifolates, sulfonamides, fansidar, macrolides, 5-fluorouracil, dapsone, or any other agent with known activity against Toxoplasma gondii.