The XO Directory

Two-year-old Oliver Sherwood is kept alive by daily doses of viagra. He has a rare condition known as pulmonary hypertension that causes chronic high blood pressure and can be controlled with four doses of Viagra a day.

The drug improves blood flow, which in adults can boost erectile function but in rare cases such as Oliver's can open the veins and capillaries to aid circulation. His mother Sarah, a part-time nurse, said: "We joke when we pick up his drugs that it would be Christmas come early for most people. Obviously the dose isn't high enough to have the effect it would on adults. "Viagra is an expensive drug but it's actually one of the cheapest to treat pulmonary hypertension.

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