whether Viagra (sildenafil) loses its effectiveness over time

There's more talk about whether Viagra (sildenafil) loses its effectiveness over time.

The latest hubbub stems from a recent study that got a lot of press. But the study results may not turn out to be true.

In some cases people THINK Viagra is losing its punch. But the problem could be due to loss of libido...or progression of the underlying disease, such as diabetes or peripheral vascular disease.

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