Viagra clinically refers to sildenafil citrate and generally costs around $50 for 1 capsule, depending on the local purchase price. Sildenafil citrate is mainly used for the treatment of erectile dysfunction in men, and is often taken 1 hour before sex. The general price is about 50 yuan per capsule, but different manufacturers, sales channels, specifications, packaging prices will also have some differences, specific to the actual purchase price. Sildenafil citrate should be taken under the guidance of a doctor, avoiding private medication. If during the use of increased heart rate, headache, nausea and other uncomfortable symptoms, to stop using the drug. This drug is contraindicated in women, people who are allergic to the product, children, people whose recent cardiovascular state is not suitable for sexual intercourse.