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Viagra, also known as Sildenafil, is a well-known medication that has been available on the market for over 20 years. It is a prescription medication that works by increasing blood flow to the penis, which can help men with ED achieve and maintain an erection during sexual activity.
Sildenafil is a highly effective treatment for ED, with studies showing that it can improve erectile function in up to 80% of men. It is typically taken about 30 minutes to an hour before sexual activity and can last for up to four hours.
A typical dose is 100mg, evidence shows that there is no advantage in taking a larger dose.