Tadalafil is usually taken half an hour before sex, and the exact dosage varies from person to person, ranging from 5mg to 20mg. Tadalafil mainly targets erectile dysfunction in men, and is taken to increase cGMP levels in the cavernous body of the penis, leading to relaxation of the smooth muscles and blood flow into the penile tissues, resulting in an erection. Tadalafil is taken differently than other medications, and the most scientific way to take it is at least half an hour before sex. The usual recommended dosage is around 10 mg, and depending on individual differences and tolerance, the dosage can be increased or decreased under the advice and guidance of a doctor, either by increasing the dose to 20 mg or decreasing it to 5 mg, but not exceeding the maximum dosage indicated. Generally, tadalafil is taken as needed, whether it needs to be taken daily or not needs to be determined by the doctor depending on the situation, the medication must be taken under the supervision of the doctor, the best dose should not be taken more than 20mg at a time. After taking it, if there is any discomfort, stop taking it immediately. If the situation is serious, you should go to a regular hospital immediately to check your health condition.