Tadalafil does not have a clearly defined course of treatment, it can be taken as needed or used at a low daily dose for about 3 months, and the specific dosing regimen should be based on the condition. Tadalafil can increase penile blood flow and improve erectile ability, and is mainly used for the treatment of erectile dysfunction in clinical practice. There is no definite regimen for this product, which can be taken as needed before sex. Alternatively, a low dose of tadalafil can be taken daily for about 3 months to assess erectile function before deciding on a further dosing regimen. Adverse reactions often seen with this product include headache, back pain, myalgia, dyspepsia, flushing, etc. It is contraindicated for those who are allergic to this product and for patients taking nitrates. It is recommended to formulate a suitable medication program according to the condition under the guidance of a physician, and should not be used blindly, so as not to affect the therapeutic effect.