When taking tadalafil tablets for the first time, you should pay attention to a clear diagnosis, and should also pay attention to the emergence of abnormal erection, vision defects to seek medical treatment, but also pay attention to the contraindications of the combined use of medication, the applicable population and so on. 1. Clear diagnosis: before using the drug, the patient’s medical history must be examined in detail to confirm the diagnosis of erectile dysfunction in men and exclude other causes. 2. Abnormal erection: Erection for more than 4 hours must be treated immediately, if left untreated, it will result in permanent loss of erectile function. 3. Visual defects: If sudden visual disturbances occur, discontinue use immediately and seek immediate medical attention. 4. Combined use: For example, it is prohibited for patients who are taking any form of nitrates, guanylate cyclase stimulators, etc. 5. Individuals for whom it is indicated: Use with caution in patients with deformed penile anatomy, or with abnormal erections. Tadalafil should not be used in patients with hereditary galactose intolerance. The product should not be used by people under the age of 18. It is necessary to take the above medications under the guidance of a doctor, and the specific treatment should be examined in a regular hospital to determine the cause of the disease, so that effective treatment can be carried out.