The generic name of Baiyunshan Viagra is Sildenafil Citrate and its minimum effective dose is 25mg, whether it is effective or not varies from person to person, and 50mg is recommended for the first time. Sildenafil citrate is clinically used to improve the symptoms of impotence in men and can increase blood flow to the corpus cavernosum. The initial recommended dosage is 50mg, which can be increased to 100mg or decreased to 25mg depending on your response. 25mg may not be effective the first time, so 50mg is recommended; if the effect is too strong, the dosage can be reduced to 25mg next time, and there is no need to adjust the dosage if the effect is satisfactory. Common side effects include back pain, rash, dizziness, headache, nausea, dyspepsia, visual abnormalities, flushing, etc. This product is contraindicated in patients who are allergic to this product and should not be used in combination with any form of nitrate medication. It is recommended to consult a physician before using the drug, and should not be used blindly.