Viagra generally refers to sildenafil, and the price of one tablet is around $30 to $100. Sildenafil can be used to treat penile erectile dysfunction, and its price is not fixed due to many factors such as manufacturer, sales channel, specification, packaging, imported or domestic. Currently, its selling price for a box ranges from $30 to $100. The specific price is subject to local pharmacies and medical institutions. Adverse reactions to sildenafil tablets include panic, flushing and dizziness. It is prohibited for those who are allergic to the drug and those who take nitrate drugs. The drug is contraindicated for women, people who are allergic to the product, children, people whose recent cardiovascular state does not allow them to have sex. The body, if there is erectile dysfunction, you need to go to the hospital for examination first, use the drug under the guidance of the doctor and avoid abusing the drug by yourself.