Tadalafil 20 mg take a capsule when used for the treatment of erectile dysfunction is generally useful, tadalafil taken once 10 mg, 20 mg is equivalent to double the dose, it is recommended to take the correct dose under the guidance of a doctor to avoid damage to sexual function. Tadalafil is a medication for the treatment of erectile dysfunction in men, which can stimulate the male penis and dilate the blood vessels in the cavernous body of the penis, which can maintain a very good erection hardness and erection time. The recommended starting dose of this drug for oral administration is 10mg, taken 25-60 minutes before sexual intercourse, and the dose can be increased to 20mg or decreased to 5mg depending on efficacy and tolerability, with the maximum recommended dose being 20mg per day.Taking one capsule of 20mg is usually useful, but it needs to be taken under a doctor’s supervision, and should not be doubled on its own. Some people may experience adverse reactions such as flushing, nausea and dizziness after taking the drug, which usually disappear on their own. It is prohibited for those who are allergic to the drug, and patients taking nitrates for treatment need to avoid using it at the same time. Drugs should be taken correctly under the guidance of a doctor, do not increase the dose without authorization, to avoid unnecessary damage to the body.