The main side effects of sildenafil citrate include dizziness, nausea, loss of appetite, rash and visual abnormalities. Sildenafil Citrate is mainly used to treat erectile dysfunction in men. The common adverse effects of this drug mainly include headache, flushing, dizziness, nasal congestion, indigestion and visual abnormalities. Rare adverse reactions mainly include facial edema, shock, fatigue, pain, rash, tachycardia, palpitations (rapid heartbeat, often accompanied by panic), hypotension, and postural hypotension. Contraindications to the use of sildenafil citrate include hypersensitivity to the drug and any of its components; during the application of this drug, it should be prohibited to apply any dosage form of nitrate and guanylate cyclase agonists, etc.; the drug is contraindicated in women, people who are allergic to the product, children, and those who should not be sexually active with recent cardiovascular status. If you need to apply this drug, you must follow the instructions of the doctor after seeking medical attention. Any adverse reactions should also be treated by a doctor as soon as possible.