A cough suppressant (antitussive); essentially synonymous with 鎮咳剤 and commonly used in medical contexts and pharmacies.
薬局で鎮咳薬を買ってもらったが、成分を確認してから服用した。
I bought a cough medicine at the pharmacy but checked the ingredients before taking it.
子供用の鎮咳薬は大人用と用量が違うので注意が必要だ。
Children's cough medicines have different dosages from adults', so caution is required.
咳が長引く場合は、鎮咳薬だけでなく医師の診察を受けるべきだ。
If a cough persists, you should see a doctor rather than relying solely on cough medicine.