There is some evidence that cranberry can help to prevent urinary tract infections; however, the evidence is not definitive, and more research is needed. Cranberry has not been shown to be effective as a treatment for an existing urinary tract infection. There is limited evidence to support its efficacy for other uses.
Drinking cranberry juice products appears to be safe, although excessive amounts could cause gastrointestinal upset or diarrhea.
Cranberry may interact with:
- atorvastatin
- medications metabolized by liver enzyme cytochrome P450 3A4 (e.g., clarithromycin, cyclosporine, diltiazem)
- nifedipine
- warfarin
People who think they have a urinary tract infection should see a health care provider for proper diagnosis and treatment. Contact your doctor if you have a history of kidney stones or if you are taking blood thinners.
Cranberry juice contains salicylic acid. Do not take cranberry juice if you have an allergy to aspirin.
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.