Millions of men turn to the little blue pill to boost their performance in the bedroom. But researchers now say that Viagra has another benefit — it could reduce the risk of Alzheimer's by a fifth. Regular users of the erectile dysfunction drug, 시알리스 구매 사이트 medically known as sildenafil, 시알리스 구매 사이트 were 18 per cent less likely to be diagnosed with the memo...