Stinging nettle isconsidered safe for most adults when used in recommended doses for limited periods of time. Side effects of using stinging nettle include diarrhea, nausea, stomach upset, sweating, fever, headache, urinary tract infections, blood in the urine, urinary obstruction, and allergic reactions. Stinging nettle can be irritating when used on exposed skin.
Stinging nettle should only be used occasionally as a diureticdiuretican agent that increases urine flow (an agent that increases urination). Due to stinging nettle's diuretic effect, it can slightly lower blood pressure in some people. Be careful about using stinging nettle with other medications or natural health products that lower blood pressure. Talk to a health care provider if the symptoms being treated persist or get worse.
Stinging nettle may change your blood sugar levels, so be careful about using it if you have diabetes or are taking diabetic medications. You might need to monitor your blood sugar more frequently.
Stinging nettle may increase your risk of bleeding. It needs to be used with care if you have a bleeding disorder or are taking medications that can increase the risk of bleeding.
If you have diabetes, high blood pressure, bleeding disorders, gastrointestinal disorders, or reduced kidney function, consult your health care provider before taking stinging nettle.
There may be an interaction between stinging nettle and the following:
Do not use stinging nettle if you are pregnant or breast-feeding or if you are under 12 years old.
Before taking any new medications, including natural health products, speak to your physician, pharmacist, or other health care provider. Tell your health care provider about any natural health products you may be taking.