Stemona sessilifolia

In Chinese pharmacopoeia the dried root of Stemona sessilifolia—known as Stemonae Radix—has been recorded for centuries as an antitussive and antiasthmatic herb, most often taken as a decoction (Bensky & Gamble, 1993). Japanese Kampo practitioners also employ the same underground tuber, simmering it in water for 20‑30 minutes to relieve chronic cough and bronchial irritation (Harada & Matsumoto, 2020). Vietnamese folk healers collect the thick, fleshy roots, boiling them in 500 ml of water for 15‑20 minutes and drinking the liquid to alleviate wet coughs (Nguyen, 2015). In all three regions the preparation involves the plant’s root rather than leaves or stems, and the resulting broth is taken warm, usually once or twice daily.

A simple decoction can be made by soaking 5 g of dried Stemona root in 250 ml of cold water, bringing it to a boil, then simmering for 20 minutes before filtering, as described by Wang et al., 2018. The infusion is taken warm, 1–2 times daily. Alternatively, a 1:5 ethanol tincture can be prepared by macerating 10 g of sliced root in 50 ml of 40 % ethanol for 30 days, shaking the jar daily (Wang et al., 2018). The tincture is used in small drops (≈5 drops) under the tongue for cough relief. Both preparations should be limited to a maximum of two weeks of continuous use and avoided during pregnancy and in children under six years, because the alkaloids can be irritating in high concentrations.

Laboratory analyses of Stemona sessilifolia consistently reveal a suite of pyridine alkaloids—tuberostemonine, stemonine, oxystemonidine, and stemoninine—that have been isolated from the root and are responsible for its spasmolytic and antitussive actions (Zhao et al., 2016; Li et al., 2019). These compounds have shown in animal models to suppress the cough reflex by modulating airway sensory nerves. No other major phytochemical groups (e.g., flavonoids, terpenes) are reported in appreciable amounts in the root, reinforcing the view that the alkaloid profile explains the traditional therapeutic effect.

Today the root remains a staple ingredient in several commercial cough‑relief syrups and in standardized extracts sold in Chinese herbal markets, while researchers continue to isolate and evaluate its alkaloids for potential new antitussive drugs (Wu et al., 2022). Sustainable cultivation programmes are being introduced to meet the growing demand while preserving wild populations, underscoring the plant’s enduring relevance in both traditional practice and modern drug discovery.

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