An expectorant that also has some muscle relaxing action. It is used in many cough preparations.

Guaifensin
| Description | |
|---|---|
| (RS)-3-(2-methoxyphenoxy)propane-1,2-diol | |
| 93-14-1 | |
| C10H14O4 | |
| 2-G;2/G;g87;gge;G 87;Dilyn;Gvaja;my301;Resil;Resyl | |
| Used to assist the expectoration of phlegm from the airways in acute respiratory tract infections. | |