Viagra is a medication that is primarily used to treat erectile dysfunction (ED) in men. The active ingredient in Viagra is sildenafil citrate, which works by increasing blood flow to the penis, helping men achieve and maintain an erection during sexual stimulation.

Dosage: Viagra is available in tablet form in dosages of 25mg, 50mg, and 100mg. It is recommended to take the medication about 30 minutes to an hour before sexual activity, but it can be taken up to four hours before. The recommended starting dose is typically 50mg, but this can be adjusted based on individual response and tolerance. The maximum recommended dose is 100mg per day.

Benefits: Viagra has been shown to be effective in improving erectile function in men with ED, helping them achieve and maintain erections that are sufficient for sexual activity. In addition, it has been found to be safe and well-tolerated in most men who take it.

Lasting effect: The effects of Viagra typically last for around four hours. However, the length of time the medication stays in the body can vary based on individual factors such as age, liver function, and other medications being taken.

It is important to note that Viagra is not a cure for ED and does not increase sexual desire. It is also not recommended for men who have certain medical conditions or are taking certain medications, so it is important to consult a healthcare professional before taking Viagra.

In summary, Viagra is a medication that can be used to treat ED and improve sexual function in men. It should be taken as directed by a healthcare professional, and it is important to be aware of the potential risks and benefits associated with its use. The effects typically last for around four hours, but this can vary based on individual factors.