A seven-year-old Scottish girl, who suffers from a rare lung condition, is being kept alive by four doses of Viagra a day.
The rare lung condition is
Primary pulmonary hypertension causes abnormally high blood pressure in the arteries of the lungs. As a result, the small arteries of the lungs become narrow, which makes it hard for blood to flow, according to the National Institutes of Health.
The Viagra works by opening the arteries and improving the blood flow.
