Viagra (sildenafil) is one of the most well-known medications used to treat erectile dysfunction (ED). Since its approval in the late 1990s, it has become a go-to solution for millions of men worldwide. However, while Viagra is highly effective in addressing sexual performance issues, many people may wonder how to tell if a man is taking it. There are both physical and behavioral signs that could indicate someone is using Viagra, but these signs are not always definitive. In this article, we...