Sildenafil can also be bought over the counter from pharmacies in certain circumstances. Non-branded (generic) tablets of sildenafil are available on the NHS, but the brand Viagra® can only be prescribed on the NHS for men with erectile dysfunction resulting from certain medical conditions. ![]() This helps to widen (relax) blood vessels and improves the flow of blood to the penis following sexual stimulation. Sildenafil works by preventing the action of a chemical in your body, called phosphodiesterase type-5. There are several causes, the most common being due to a narrowing of the arteries that take blood to the penis. ![]() ![]() ![]() Erectile dysfunction (sometimes called impotence) means that you cannot get or maintain a proper erection.
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