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Viagra, also known by its generic name sildenafil, is a medication used to treat erectile dysfunction (ED) in men. ED is a common condition that affects many men, particularly those over the age of 40. Viagra works by increasing blood flow to the penis, which helps to produce and maintain an erection during sexual activity. pharmacy in uae - Viagra is usually taken 30 minutes to an hour before sexual activity, and its effects can last for up to 4 hours. The medication comes in different doses, ranging from 25mg to 100mg, and it is important to follow the dosage instructions provided by a healthcare provider. Viagra should not be taken more than once a day, and it is not recommended for use in women or children. Like all medications, Viagra can cause side effects. The most common side effects include headache, flushing, and upset stomach. More serious side effects are rare, but can include sudden vision loss, hearing loss, and priapism (a prolonged and painful erection that can last for several hours). It is important to seek medical attention if any of these side effects occur. Viagra is available by prescription only, and it is important to obtain it from a licensed and reputable pharmacy. There are many websites that claim to sell Viagra without a prescription, but these sites are often selling counterfeit or fake medications.