*Pregnancy and breast-feeding: Hibiscus is UNSAFE to take during pregnancy. There is some evidence that hibiscus might start menstruation, and this could cause a miscarriage. Not enough is known about the safety of taking hibiscus during breast-feeding. Stay on the safe side, and avoid use.
* Acetaminophen (Tylenol, others) interacts with hibiscus.
* Effects on Estrogen : Consuming hibiscus tea lowers estrogen levels, and those using hormone replacement therapy (HRT) or taking birth control pills should avoid drinking the tea, according to research done by Guru Jambheshwar University of Science and Technology, India, and published in "eCAM," an alternative medicine journal.
* Blood Pressure : Hibiscus tea lowers blood pressure, has diuretic properties and mild effects on dilation of blood vessels, according to Maureen Williams, ND, of the Bastyr Center for Natural Health in Seattle, Washington. People with low blood pressure or those with hypertension who take blood pressure-lowering medicines should avoid drinking the tea due to possible contradictory interactions between the tea and medications.
==The benefits of Hibiscus are==
*High cholesterol. An early study shows that taking 1 gram daily of a specific extract of hibiscus leaves (Green Chem, Bangalore, India) does not seem to improve cholesterol levels.