Pre-existing psychiatric condition, especially severe epression, or a history of severe psychiatric disorder CNS trauma or active seizure disorders requiring medication. Patients with any history of cardiovascular dysfunction. Patients with any hemoglobinopathy including but not limited to thalassemia major and minor Poorly controlled diabetes mellitus Chronic pulmonary disease Immunologically mediated disease Clinical gout Sexually active females of childbearing potential must be practicing adequate contraception, Sexually active males must be practicing acceptable methods of contraception (vasectomy, condom + spermicide, monogamous relationship with a female partner who practices an acceptable method of contraception) during the treatment period and for 6 months after discontinuation of therapy.