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Avoid grapefruit as it can increase your chance of experiencing side effects. An erection involves several different factors, so it is important to understand the process. This can help to give you an understanding of why Viagra doesn’t always work.
Experts believe around 30–50 million American men have experienced ED at some point. It can happen at any age but becomes more common as men get older. By the time a man is in his 40s, he has about a 40% chance of having experienced ED at some point. That likelihood increases by about 10% for each decade of life (Ferrini, 2017