a. Pregnancy or Lactation: i. For women of childbearing potential, there is a requirement for a negative urine pregnancy test. b. Any cardiovascular disease, defined as a clinically significant EKG abnormality at the time of screening or any history of: stroke, heart failure, myocardial infarction, angina pectoris, or coronary arterial bypass graft or angioplasty. Diagnosis of 2nd or 3rd degree heart block or any non-physiological arrhythmia judged by the investigator to be exclusionary. c. Renal insufficiency (GFR < 60 ml/min, using the MDRD equation as report by the OHSU laboratory). d. Hematocrit of less than or equal to 34%. e. History of severe hypoglycemia during the past 12 months prior to screening visit or hypoglycemia unawareness as judged by the investigator. f. Adrenal insufficiency. g. Any active infection. h. Known or suspected abuse of alcohol, narcotics, or illicit drugs (except marijuana use).