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Coltsfoot Side Effects, Interactions and Warnings

Coltsfoot has been identified as an unsafe herb.
- Am J Health Syst Pharm 1999 Jan 15;56(2):125-38; quiz 139-41 -- Unsafe and potentially safe herbal therapies. -- Klepser TB, Klepser ME.

Coltsfoot produces a stimulating effect on the growth of Candida albicans.
- Zh Mikrobiol Epidemiol Immunobiol 2001 Sep-Oct;(5):71-2 -- Effect of medicinal plant extracts on the growth of microorganisms -- Baronets NG, Adlova GP, Mel'nikova VA.

Chemical studies on the dried, young flowers used in this experiment suggested that the carcinogenicity of coltsfoot is most probably due to senkirkine, a hepatotoxic pyrrolizidine alkaloid.
- Gann 1976 Feb;67(1):125-9 -- Carcinogenic activity of coltsfoot, Tussilago farfara l. -- Hirono I, Mori H, Culvenor CC.

Do not use if you are pregnant or nursing.
- Hepatic veno-occlusive disease in newborn infant of a woman drinking herbal tea. -- Roulet M, et al. -- J Pediatr. 1988 Mar;112(3):433-6.

last update: March 2010

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