Viagra is the trade name, generically known as sildenafil, and is usually around $30 to $50 a capsule. Sildenafil is a drug used to treat erectile dysfunction in men, and its price is not fixed due to a variety of factors such as sales channels, specifications, packaging, and region. Currently, its selling price for one capsule ranges from $30 to $50. The specific price is subject to local pharmacies and medical institutions. Sildenafil belongs to the class of PDE5 inhibitors, usually taken about 1 hour before sex, after taking sexual stimulation can help penile erection, enhance the hardness of erection as well as erection time, improve the quality of patients’ sex life. It is worth noting that some people may experience adverse reactions after taking it, such as dizziness, headache, blurred vision, flushing and so on. Secondly, sildenafil is forbidden to be combined with nitrate drugs, and this drug is contraindicated for women, those who are allergic to this product, children, and those whose recent cardiovascular status is not suitable for sexual life. Sildenafil is a prescription drug, you must be prescribed by a doctor to buy and take, do not blindly take the drug on your own.