3. Patients must not have: a) active infection; b) disease that will obscure toxicity or dangerously alter drug metabolism; c) serious intercurrent medical illness; d) acute or chronic pulmonary disease, pulmonary embolus, hypertension, diabetes, metabolic syndrome, stroke, heart disease,myocardial infarction, angina, coronary angioplasty, congestive heart failure, or coronary bypass surgery; e) allergies to sulfa drugs; f) severe psychiatric illness; g) uncontrolled hypertension (i.e. ->135/>85 mm Hg) on three repeated measurements during the 6 weeks prior to enrollment on the study