Generic name of Viagra is Sildenafil Citrate Tablets, and side effects such as headache and dizziness may occur with regular consumption, but the drug is not easy to accumulate and metabolized quickly, so it is not harmful to the body. Sildenafil Citrate increases blood flow to the penis, which helps in erection and is clinically used in the treatment of erectile dysfunction in men. This medication is recommended to be taken as needed, not more than once a day. This medication can be applied for a long period of time and is effective in improving the symptoms of erectile dysfunction. However, it is recommended to take it every other day, not too often, and using it in the right way does not cause any significant harm to the body. Common side effects of this product include visual abnormalities, indigestion, nasal congestion, flushing, dizziness, etc. It is contraindicated for patients who are allergic to this product as well as patients taking nitrate drugs. Please use the drug under the guidance of a physician, and should not blindly take the drug to avoid poor therapeutic effects.