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Grayanotoxin: the pharmacology of mad honey
Grayanotoxins are a family of diterpenoid compounds found in Rhododendron and related Ericaceae plants. They bind to voltage-gated sodium channels in nerve and muscle tissue, preventing inactivation and producing sustained depolarization. This is the mechanism behind both the therapeutic and toxic effects of mad honey.
Medically reviewed by Dr. Irvine Russell, M.D. Updated 2026-04-17