Adrenaline (epinephrine) and ephedrine are both used in the medical field for their bronchodilator effects. Adrenaline, a hormone produced by the adrenal glands, is administered to treat severe allergic reactions (anaphylaxis) and acute asthma attacks. Ephedrine, derived from the Ephedra plant, is used to relieve bronchospasms in conditions like asthma and bronchitis. Both drugs share a common feature as sympathomimetic agents, stimulating the sympathetic nervous system. They activate adrenergic receptors, leading to increased heart rate, dilation of bronchioles, and heightened alertness. This shared mechanism of action makes them valuable in managing respiratory and cardiovascular conditions.