decongestant

名词 decongestant:

1. a drug that decreases pulmonary congestion

de.con.ges.tant

n.（名词）
A medication or treatment that breaks up congestion, as of the sinuses, by reducing swelling.
减充血的药剂：通过使肿块缩小来止住窦等部位的充血的药物或治疗
adj.（形容词）
Capable of relieving congestion.
能减轻充血的