Hibiscus, especially white hibiscus, is considered to have medicinal properties in the Indian traditional system of medicine.
In Mexico, the red variety is also popular to make a refreshing beverage. The drink is known as agua de Jamaica and is quite popular for its color, tanginess and mild flavor; once sugar is added, it tastes somewhat like cranberry juice. Dieters or persons with kidney problems often take it without adding sugar for its beneficial properties and as a natural diuretic. It is made by boiling the dehydrated flowers in water; once it is boiled, it is allowed to cool and drunk with ice. — Wikipedia
Did you know that infusion from this flower is also believed to benefit hearth disease? A 2008 USDA study shows consuming hibiscus tea lowers blood pressure in a group of pre-hypertensive and mildly hypertensive adults.