Sildenafil is taken up to once a day and used on alternate days. Therefore, you can take Sildenafil up to 8 times a month, although continuous use is not recommended. Sildenafil improves erectile function in men by stretching the smooth muscles of the corpus cavernosum and promoting the inflow of blood during erection. This product is recommended to be taken as needed before sexual intercourse, used up to once a day, and is recommended to be used on alternate days. Therefore it is possible to use Sildenafil 8 times a month, but do not use it every day in a row. The common adverse effects of this drug are flushing, dizziness, lightheadedness, indigestion, nausea, rash, back pain, muscle aches, visual abnormalities, etc. It is contraindicated for those who are allergic to sildenafil and it should not be used in combination with nitrate drugs. It is recommended to take under the guidance of a doctor, and should not be used blindly on its own.