肾上腺素（Epinephrine或Adrenaline）是激素及神经传导物质，也是一种药物。肾上腺素被应用于治疗多项疾病，包含全身性过敏反应、心搏停止，以及表面出血等等，吸入式的肾上腺素有时会被用于改善义膜性喉炎的症状。另外当哮喘的第一线治疗皆无效时，也可能会考虑使用肾上腺素。由于口服肾上腺素会迅速被降解而失效，因此须从静脉、肌肉，或皮下注射给药。也可以吸入的方式给予药物。

常见的副作用包括晕眩、焦虑和盗汗。心跳过快和高血压也可能发生，偶尔也会导致心律不整。虽然此药物在怀孕以及哺乳使用的风险还未厘清，但对母亲的益处还是必须纳入考虑。

Epinephrine, also known as adrenalin or adrenaline, is primarily a medication and hormone. As a medication it is used for a number of conditions including: anaphylaxis, cardiac arrest, and superficial bleeding. Inhaled epinephrine may be used to improve the symptoms of croup. It may also be used for asthma when other treatments are not effective. It is given intravenously, by injection into a muscle, by inhalation, or by injection just under the skin.