Dr. Alexander Tsertsvadze of the Ottawa Health Institute in Canada and his colleagues said that they were concerned that the studies reviewed for Viagra did not follow patients up for longer than 12 weeks

They said that there needed to be a better balance between ascertaining the effectiveness of the long-term effects OF Viagra.

From the data there was, it seemed that men taking Viagra, as opposed to a placebo were 56% more likely to experience side effects.

These are generally mild, with the most common including headaches, facial flushing, difficulty breathing and vision problems. Writing in this month’s edition of the journal Urology, they said that it would be worthwhile to consider different methods to lessen the likelihood of patients experiencing side effects, such as a flexible dosing regimen.

At the moment millions of men take Viagra around the world with few problems.

Viagra is one of the best selling drugs on the market for treating erectile dysfunction.

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