Jingo and Viagra are trade names, the generic name of which is sildenafil citrate, and after application, you may experience nausea, dyspepsia, vomiting, rashes, and other unpleasant symptoms. This drug is mainly used for erectile dysfunction. After application of the drug, common adverse reactions include headache, flushing, dizziness, nasal congestion, indigestion, and visual abnormalities. Rare adverse reactions include facial edema, shock, weakness, pain, rash, tachycardia, palpitations, hypotension, postural hypotension, etc. It is important to note that the above adverse reactions should be disposed of at the earliest possible time by seeking medical attention after the administration of the drug. This drug should be contraindicated in people who are allergic to this product, or during the application of guanylate cyclase agonists, nitrate drugs, women, children and other groups of people; the presence of pigmented retinitis, cardio-cerebral and cerebrovascular diseases and patients who have experienced severe cardiac arrhythmia and shock in the last six months should be cautious of the use of this drug. Before application, erectile dysfunction should be diagnosed and then used strictly under medical supervision.