Experts say Levitra, the 'little orange pill' is now the fastest growing treatment for erectile dysfunction

Ian Russell, a specialist nurse who runs a clinic at the Dumfries and Galloway Royal Infirmary, said: 'Many patients used to think Viagra worked for everyone but there are many men for whom it doesn't, or works less well than Levitra.

'As many as 47 per cent of men who have tried Viagra stop taking it, the main reasons being a lack of effectiveness and unwanted side-effects.

It is great to have a new treatment option in Levitra, which is showing very good results.

In an international study involving 463 men, all of whom had made at least six unsuccessful attempts to have sex using Viagra, Levitra worked for 62 per cent. The data will be presented today at the Sexual Medicine Society of North America Congress in Denver.

Levitra belongs to the same class of drugs as Viagra which is why many doctors thought there was no reason to try it as an alternative. Distributed by the drug makers GSK and Bayer, Levitra is available on the NHS for certain groups of patients with impotence while a private prescription can be given by a GP.

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