Viagra is the trade name, generic name is sildenafil citrate, there is no difference with domestic sildenafil citrate except for the price, the drug has the effect of treating erectile dysfunction. It is recommended to take nitrate drugs, allergy to the drug is prohibited to use the drug. Sildenafil citrate has the effect of treating erectile dysfunction, and because of the existence of drug consistency evaluation (meaning that generic drugs that have passed consistency evaluation need to be consistent with the original drug in terms of quality), both domestically produced and imported sildenafil citrate are effective, and there is generally no significant difference except for price. It is recommended that patients taking nitrates avoid sildenafil citrate. In addition, the drug is contraindicated for those who are allergic to the ingredients of Sildenafil Citrate. Patients should use Sildenafil Citrate under the guidance of a doctor and should not use the drug without authorization. It is worth noting that some patients with Sildenafil Citrate may experience dizziness, fainting and other manifestations of low blood pressure. In addition, Sildenafil Citrate is forbidden to be taken by children, women, and breastfeeding women.