The recommended usage of Tadalafil is to take it as needed, up to 1 time a day, and it is recommended to use the drug every other day, not continuously, and it is appropriate to take it 3 to 4 times a week. Tadalafil can increase penile blood flow and thus improve penile erectile function, clinically it is mainly used for the treatment of male erectile dysfunction. It is clinically recommended to take this product as needed, about 1 hour before sexual intercourse, can produce better therapeutic effect. It is not recommended to take this product continuously on a daily basis, so 3 to 4 times a week as needed is appropriate and should not be taken in excess. Adverse reactions to this product include dyspepsia, back pain, myalgia, headache, flushing, nasal congestion, etc. It is contraindicated in patients with known allergies to this product and in patients taking nitrates. It is recommended to consult a physician before using the drug and should not take the drug blindly on its own.