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Nettle Side Effects, Interactions and Warnings

Possible allergic reactions such as skin rash or upset stomach.

Use caution if you are taking sedatives, diabetic medicine, or blood pressure medication.
-Newall C, Anderson L, Phillipson J. -- Herbal Medicines: A Guide for Health-Care

A description of the case of a 57 year old woman is given who showed the symptoms of an atropine poisoning after drinking stinging nettle tea. The analyses of the tea specimen proved bad defilements among other things with elements of the "belladonna" (Atropa belladonna). Several similar reports became known recently and it seems to be necessary to discuss checking the purity of the tea species.
- Fortschr Med 1980 Oct 16;98(39):1525-6 -- [Atropine poisoning from "health tea"]-- Scholz H, Kascha S, Zingerle H.

Results demonstrate an acute hypotensive action of U. dioica that indicates a direct effect on the cardiovascular system. Moreover, diuretic and natriuretic effects were also observed, suggesting an action on the renal function. Finally, the plant extract seems to have a toxic effect at the higher dose.
- J Ethnopharmacol 2000 Nov;73(1-2):95-100 -- Acute diuretic, natriuretic and hypotensive effects of a continuous perfusion of aqueous extract of Urtica dioica in the rat. -- Tahri A, Yamani S, Legssyer A, Aziz M, Mekhfi H, Bnouham M, Ziyyat A.

last update: March 2010

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