Efficacy and safety of “Yahom” as a traditional Thai herbal therapy: a systematic review

Chootip, Krongkarn, Chaiyakunapruk, Nathorn, Soonthornchareonnon, Noppamas, Scholfield, C. Norman and Fuangchan, Anjana (2017) Efficacy and safety of “Yahom” as a traditional Thai herbal therapy: a systematic review. Journal of Ethnopharmacology, 196 110-123. doi:10.1016/j.jep.2016.12.002

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Author Chootip, Krongkarn
Chaiyakunapruk, Nathorn
Soonthornchareonnon, Noppamas
Scholfield, C. Norman
Fuangchan, Anjana
Title Efficacy and safety of “Yahom” as a traditional Thai herbal therapy: a systematic review
Journal name Journal of Ethnopharmacology   Check publisher's open access policy
ISSN 1872-7573
Publication date 2017-01-20
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.jep.2016.12.002
Open Access Status File (Author Post-print)
Volume 196
Start page 110
End page 123
Total pages 14
Place of publication E Park, Shannon, Clare Ireland
Publisher Elsevier Ireland
Language eng
Formatted abstract
Ethnopharmacological relevance: Yahom is a traditional Thai medicine used to treat syncope and abdominal discomfort.

Aim of the study: This study aimed to systematically review all available evidence which purports to support these claims.

Material and methods: The systematic review accorded with the Cochrane Collaboration framework and PRISMA reporting. Databases including MEDLINE, Excerpta Medica Database (EMBASE), Cochrane library database, and Google Scholar were searched by keywords, Yahom and Ya-hom. Pharmacological and toxicity data from non-animal and animal studies were included.

Results: Twenty-four articles: 2 on in vitro cell lines or bacteria, 3 in vitro cell-free, 5 in vitro animal, 13 in vivo and 1 human mainly reported (A) Cardiovascular effects (i) transient hypotension (0.2–0.8 g/kg, intravenous injection (i.v.)), increased cerebral blood flow (2 g/kg, single oral) and vascular dilatation/relaxation (ii) elevated blood pressure (BP) (0.2–0.8 g/kg, i.v. or 2–4 g/kg oral) and vasocontraction. Single Yahom doses (3 g) given to healthy volunteers had no effect on cutaneous blood flow, ECG or systolic BP although marginally increased diastolic BP was claimed. (B) Yahom (2–4 g/kg) completely inhibited gastric acid secretion evoked by gastric secretagogues. (C) Toxicity: Chronic oral doses of selected Yahoms to rodents (0.001–1 g/kg) supports its status as generally regarded as safe.

Conclusions: Most studies supported declared objectives relating to perceived Yahom actions, but lacked background demonstrating clinical efficacy, and mechanistic data that would validate conclusions. Our study suggests that research into traditional medicinal herbs needs underpinning by appropriate clinical interventions and pharmacovigilance, thereby optimising efficacy and minimizing toxicity by combining traditional wisdom and modern testing.
Keyword Folk medicines
Herbal medicines
Systematic review
Thai traditional herbs
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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