<unk>  is an expectorant that is FDA approved for the treatment of loosening phlegm (mucus) and thinning of bronchial secretions to make coughs more productive..   Common adverse reactions include nausea, vomiting.
Guaifenesin
Nomifensine
Rescinnamine
Cimetropium bromide
Glycopyrronium bromide
Methacholine
Alfaxalone
Ephedrine