Dandelion may cause an allergic reaction in some people when eaten or applied to the skin. If you have a sensitivity to other plants in the same family of plants, such as ragweed, daisies or thistle, you may also have a sensitivity to dandelion. If you experience symptoms like swelling, itching or redness, you should discontinue use immediately and talk to your health care provider.
Dandelion is high in vitamin K, which may impact blood clotting. If you’re taking Warfarin or another blood thinner, you need to maintain consistent vitamin K intake to prevent interfering with your medication.
Because dandelion acts as a natural diuretic, it may affect the excretion of lithium from the body and could lead to increases in lithium levels. Consult with your doctor if you are taking lithium to determine if dandelion is right for you.
It may also decrease absorption and effectiveness of certain antibiotics, including enoxacin, norfloxacin, trovafloxacin, ciprofloxacin, sparfloxacin and grepafloxacin.
For most, however, dandelion greens and dandelion root side effects are minimal, and dandelion can be a safe and healthy dietary addition.