Source / episode info
- **Episode:**608
- **Title:**DIP Ep 608: Herbal Supplements and The USMLEs
- **Published:**2025-06-04
- Source:Episode page
One-liner
This episode emphasizes recognizing high-yield toxicities associated with common herbal supplements, including St. John's Wort (CYP induction), Ginkgo/Garlic/Ginseng (antiplatelet effects), Licorice (mineralocorticoid excess), and Black Cohosh/Echinacea (hepatotoxicity).
High-yield summary
- St. John's Wort: Is a potent CYP450 inducer, accelerating the metabolism of co-administered drugs, leading to reduced efficacy and shorter half-lives for critical medications (e.g., oral contraceptives, anticoagulants).
- Bleeding Risk Triad: The combination of Ginkgo Biloba, Garlic, and Ginseng all inhibit platelet aggregation, significantly increasing bleeding risk, especially when combined with antiplatelet agents like aspirin or NSAIDs.
- Licorice Toxicity: Contains glycyrrhizic acid, which inhibits the enzyme 11-hydroxysteroid dehydrogenase type 2 (11-HSD2). This leads to accumulation of cortisol and subsequent mineralocorticoid receptor (MR) agonism, causing pseudo-hyperaldosteronism (hypertension, hypokalemia, metabolic alkalosis).
- Black Cohosh & Echinacea: Both are associated with significant hepatotoxicity. Black Cohosh is linked to severe hepatitis in women presenting with menopausal symptoms; Echinacea can cause hypersensitivity reactions for URI symptoms.
- Fenugreek/Weight Loss Supplements: Compounds like fenugreek may act as _1-agonists, causing vasoconstriction and acute hypertension.
Learning objectives
- Identify the mechanism and clinical consequences of St. John's Wort as a CYP450 enzyme inducer.
- Recognize which herbal supplements pose an increased risk of hemorrhage due to antiplatelet effects (Ginkgo, Garlic, Ginseng).
- Understand the pathophysiology of pseudo-hyperaldosteronism caused by licorice consumption.
- Correlate specific herbs with organ toxicities (e.g., Black Cohosh -> liver; Echinacea -> hypersensitivity).
- Counsel patients on supplement use relative to surgical procedures due to bleeding risk.
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