Taking tadalafil for one month in a row is effective for impotence, however, it is recommended to continue taking the drug for about 3 months before going to the hospital to evaluate the condition. Tadalafil is more effective for impotence as it can stretch the smooth muscle of the cavernous body of the penis and increase the inflow of blood. This product can be taken as needed before sex, or low-dose continuous medication. This product requires long-term persistent use of medication, it is recommended that after 3 months of continuous use of medication to the hospital to review the improvement of sexual function, and then decide on further use of the drug program. Tadalafil has adverse reactions such as dizziness, flushing, nausea, dyspepsia, rash, back pain, headache, etc. It is forbidden for patients who are allergic to this drug, and it should be noted that this product should not be used in combination with nitrate drugs. It is recommended to use the drug under the guidance of a doctor, and should not be used blindly.