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Impotence or, to give it its correct name, erectile dysfunction affects an astounding one in ten men in the UK.
Until recently, the disorder was a taboo subject, but with increased publicity in the last few years, even the most reluctant men are beginning to seek medical help.
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For 80 to 90 percent of men, he says, one or other of these drugs will be effective.
Most of the underlying causes of impotence involve blood vessels, says Dr Dinsmore.
For years, the only treatment option was injections into the penis.
Then came Viagra, the little blue pill that works directly on smooth muscle - a type of muscle in our bodies that we can't control consciously - to allow blood to flow into the penis and cause an erection.
Dr Dinsmore suggests that rather than thinking of it as a competitor to Viagra, the two drugs should be used as alternatives.