Cranberry is a small, red-colored fruit produced by the Vaccinium macrocarpon plant. Extract derived from this tart-yet-sweet fruit may yield health benefits when used medicinally. Historically, cranberry capsules have been used to prevent and treat health problems affecting the bladder and kidneys such as urinary tract infections. Before taking this supplement, be sure to talk with your medical provider about the side effects of cranberry capsules.
No Side Effects
When used as directed, cranberry capsules typically do not cause side effects. However, drinking too much cranberry juice may cause stomach irritation, which may result in diarrhea or nausea. If you experience any unusual health problems while taking cranberry supplements, consult your doctor.
Kidney Stones
Cranberries contain a high level of a substance called oxalate. Consuming large amounts of oxalate may increase your risk of developing kidney stones, the University of Maryland Medical Center warns. Symptoms associated with kidney stones include severe side or back pain, blood in your urine, nausea and vomiting, frequent or painful urination and fever. Seek immediate care from your doctor if you develop any kidney stone symptoms while taking cranberry capsules.
Drug Interactions
Discuss all medications you are taking with your physician before beginning treatment with cranberry capsules. Concomitant use of cranberry and blood-thinners, such as warfarin, should be avoided. This treatment combination may increase your risk of developing unusual bleeding complications such as easy bruising.
Contraindications
Inform your medical provider of all health problems or concerns you may have before taking cranberry capsules. Cranberry is safe to use during pregnancy and breastfeeding. Do not use cranberry capsules if you have a personal history of kidney stones unless otherwise instructed by a medical professional.
