Viagra is the trade name and generic name of Sildenafil Citrate Tablets, which may cause side effects and hazards such as facial edema, angina, and vomiting after using the drug. Sildenafil Citrate Tablet is mainly used for the treatment of erectile dysfunction. Side effects such as facial edema, angina, vomiting arthritis, dyspnea, cystitis, urinary incontinence and other side effects may occur after administration of the drug. Combination with guanylate cyclase agonists needs to be avoided during administration to avoid abnormalities. It should be contraindicated for patients who take nitrates intermittently or regularly, as well as for people who are allergic to the product, children and other people. If you want to use Sildenafil Citrate Tablets, it is recommended to go to a regular hospital to consult a doctor and use the drug under the doctor’s guidance, and it is strictly prohibited to use the drug without authorization.