Hibiscus is likely safe for most people when consumed in food amounts. It is possibly safe when taken by mouth appropriately and in medicinal amounts. The possible side effects of hibiscus are not known.

Special Precautions & Warnings:

Pregnancy and breast-feeding: Hibiscus is possibly unsafe when taken by mouth during pregnancy. There is some evidence that hibiscus might start menstruation and this could cause a miscarriage. There is not enough reliable information about the safety of taking hibiscus if you are breast-feeding. Stay on the safe side, and avoid use.

Diabetes: Hibiscus might decrease blood sugar levels. The dose of your diabetes medications might need to be adjusted by your healthcare provider.

Low blood pressure: Hibiscus might lower blood pressure. In theory, taking hibiscus might make blood pressure become too low in people with low blood pressure.

Surgery: Hibiscus might affect blood sugar levels, making blood sugar control difficult during and after surgery. Stop using hibiscus at least 2 weeks prior to a scheduled surgery.

(Source: www.webmd.com)