yes, Definately, these are very helpful.Best example is Mulathi- botanical name- Glycorrhiza glabra has excellent antitussive properties.It basically does so by loosening mucus from the respiratory tract.

Answered by Dipeeka K , an ibibo Citizen, at 9:43 PM on August 14, 2008

Expectorants soften and liquefy hard, dry phlegm and help expel wastes and mucus from the respirator tract. These are used for moist coughs, asthma, emphysema, but also help clear mucus from post-nasal drip or sinus congestion. Examples include Garlic, Eucalyptus, and Ephedra.

http://www.divineremedi es.com/ayurveda_questions.htm

Answered by My creations , an ibibo Master, at 1:39 PM on August 14, 2008