adrenaline

:  epinephrine ◆Adrenaline is used in both technical and nontechnical contexts. It is commonly used in describing the physiological symptoms (such as increased heart rate and respiration) that occur as part of the body's fight-or-flight response to stress, as when someone is in a dangerous, frightening, or highly competitive situation, as well as the feelings of heightened energy, excitement, strength, and alertness associated with those symptoms. He felt a rush of adrenaline as he parachuted from the airplane. The fans were jubilant, raucous, their adrenaline running high. — W. P. Kinsella My reputation was as a single-day racer; show me the start line and I would win on adrenaline and anger, chopping off my competitors one by one. — Lance Armstrong In figurative use, it suggests a drug that provides something with a jolt of useful energy and stimulation. London's summer antiques scene has been given a massive injection of adrenaline. — Town and Country