Synopsis

Source of validity: Traditional
Rating (out of 5): 2

The blackboard tree (Alstonia scholaris) has a long history of use in traditional medicine across South and Southeast Asia. In Ayurvedic and traditional Chinese medicine systems, various parts of the tree, particularly the bark, have been used to treat respiratory ailments, including congestion, cough, asthma, and bronchitis. The rationale for its use comes from its bitter principles, which are believed to have expectorant and anti-inflammatory properties that may help clear airway passages and ease breathing. Ethnobotanical texts and local healers often mention decoctions or extracts of the bark being administered as part of remedies for chest congestion and related symptoms.

However, the scientific validation for these uses is still limited. Some pharmacological studies have reported that extracts from Alstonia scholaris possess anti-inflammatory, antimicrobial, and mild bronchodilatory effects, lending partial support to its traditional applications for respiratory complaints. Despite these findings, there is a lack of robust clinical trials or rigorous scientific data specifically confirming its efficacy in relieving congestion in humans. The rating of "2" reflects the predominance of traditional use over strong scientific backing. While the historical and anecdotal record is substantial, those considering its use should be aware that modern medical evidence for its effectiveness in treating congestion is still developing.

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