Viagra can treat many conditions besides erectile dysfunction.

David Cole/Global.

If someone is considering using Viagra as an impotence treatment, they can be forgiven for thinking that there is now another reason to go ahead with it. Some News headlines This class of drugs, known as PDE5 inhibitors, may prevent people from developing, say. It is the name of a mental disease.

It sounds like medical news that’s too good to be true — and sadly, the headlines are probably premature in this case.

These stories are based on a study that found that taking erectile dysfunction drugs…