You will return to the clinic 24, 48, and 72 hours after your first dose (Study Days 2, 3, and 4). You will be asked questions about your medical history and the medications you used since the last visit. You will have a physical exam, including measurement of your vital signs, routine blood (about 1 teaspoon), and an ECG. The ECG will only be done on Day 2 (not on Days 3 and 4). A blood sample (less than half of a teaspoon) will be drawn for PK testing. You will be given your daily dose of atiprimod.