1. we will determine the effect of the medication on catecholamines and/or markers of inflammation and/or oxidative stress. We will draw a blood sample at baseline and after the medication has taken effect. A saline lock or small flexible intravenous catheter will be placed for this purpose. For each medication trial, the amount of blood drawn would be up to 6 teaspoons. The total blood drawn for all the medication trials would not exceed 36 teaspoons.