A beta blocker (trade name Lopressor) used in treating hypertension and angina and arrhythmia and acute myocardial infarction,has adverse side effects (depression and exacerbation of congestive heart failure etc.).

• 一种用来治疗高血压、咽绞痛、心律不齐和心肌梗塞的受体阻滞药，有副作用（低压和心肌梗塞）。