Herbal medicine is the first form of healthcare known to humankind. Herbs had been used by all cultures throughout human history. It was an integral part of the development of modern civilization. Primitive man observed and valued the great variety of plants available to him. The plants provided us medicine, simple fare, clothing, and shelter. Much of the curative use of plants seems to have been developed through observing of wild nature, and by tests and errors.
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Revatio (sildenafil) is used to treat pulmonary hypertension (high blood pressure in the blood vessels between the heart and lungs) when people have not responded to conventional treatment.