Epinephrine (adrenaline) is a substance produced by the body (in the adrenal gland) in response to stress such as infection or injury. Endotoxin is a man- made substance, which causes the body to "mimic" sickness (fever, chills, and achiness) for a few hours. This study is designed to give epinephrine before and/or after endotoxin to determine if this medication can prevent or relieve any of the symptoms caused by endotoxin.