Milk thistle is a flower -- you may be allergic

Adverse Reactions:
Few reactions have been reported in the literature other than brief stomach discomfort, diarrhea, and mild allergic reactions. If you are allergic to ragweed, chrysanthemums, marigolds, and daisies, you may be allergic to Milk Thistle.

Drug Interactions:
Milk Thistle may interact with the following drugs: lorazepam (Ativan), lamotrigine (Lamictal), entacapone (Comtan), amitriltyline (Elavil), clopidogrel (Plavix), clozapine (Clozaril), diazepam (Valium), estradiol (Estrace), grepafloxacin (Raxar), mirtazepine (Remeron), ondansetron (Zofran), Tacrine (Cognex), verapamil (Calan), warfarin (Coumadin), zileuton (Zyflo), lovastatin (Mevacor), ketoconazole (Nizoral), Itraconazole (Sporanox), fexofenadine (Allegra) and triazolam (Halcion).

Always tell your doctor if you are taking Milk Thistle, especially if you are also taking any prescription drugs.