Which is an action of Asclepias tuberosa (Pleurisy Root)?

• A. Astringent
• B. Expectorant
• C. Sedative
• D. Hypnotic

Answer: (B)

Asclepias tuberosa, or Pleurisy Root, is best known for its expectorant action. The root helps loosen and thin mucus in the airways and stimulates the production of secretions, making coughs more productive and helping to clear chest congestion. This traditional use fits with treating pleurisy and bronchial conditions where expelling mucus provides relief. It’s not primarily an astringent, which would tighten tissues and reduce secretions, nor a sedative or hypnotic, which would affect the nervous system and sleep—so those actions don’t match its typical herbaceous profile. Constituents like saponins and mucilaginous compounds in the root contribute to the irritant/secretory effect that promotes drainage of the respiratory tract, reinforcing its role as an expectorant.