when knowing what it does is more important than knowing what it does

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BBC NEWS | UK | England | Tyne | Viagra used to save baby's life:

Lewis Goodfellow was born at 24 weeks weighing just 1lb 8oz. One of his lungs had failed and not enough oxygen was able to get into his bloodstream.

Doctors at Newcastle's Royal Victoria Infirmary then tried Sildenafil, also known under the trade name of Viagra, and Lewis is now home with his parents.

The drug opened up tiny blood vessels in the baby's lungs.

Parents Jade Goodfellow and John Barclay, from Walker, Newcastle believe the drug - more usually associated with anti-impotence - saved his life.