在2004年，他们指出：止咳糖浆中的两种最普通的有效成分(右美沙芬和苯海拉明)，在治疗咳嗽症状中与安慰剂成分有相同的功效。

In 2004, they showed that the two most common active ingredients in cough syrup, dextromethorphan and diphenhydramine, had the same effectiveness in treating cough symptoms as a placebo ingredient.

youdao

在2004年，他们指出：止咳糖浆中的两种最普通的有效成分(右美沙芬和苯海拉明)，在治疗咳嗽症状中与安慰剂成分有相同的功效。

In 2004, they showed that the two most common active ingredients in cough syrup, dextromethorphan and diphenhydramine, had the same effectiveness in treating cough symptoms as a placebo ingredient.

youdao