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"Viagra is a medicine for erectile dysfunction that, when taken on an empty stomach, should take effect in less than 60 minutes. &amp;nbsp;Viagra only works if you are sexually aroused and remains effective in the body for between 4 and 6 hours."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.weldricks.co.uk/products/viagra-25mg-pack-of-4>