There is no definite time limit for taking Tadalafil, and it is generally recommended to take the medication for 1 to 3 months before assessing the situation and deciding whether to continue the medication. Tadalafil can increase blood flow to the penis during erection, improve erectile function, and is mainly used for erectile dysfunction. There is no clinical rule on the maximum length of time this product can be taken; patients may take it as needed, no more than once daily. Patients can take it as needed, no more than once a day, or at a low daily dose for 1 to 3 months, after which erectile function can be evaluated, and if there is improvement, the drug can be discontinued or the dose can be reduced. Adverse reactions that commonly occur with the use of this product include back pain, headache, myalgia, flushing, and dyspepsia, and it is contraindicated in patients who are allergic to this product, and in patients who are currently using nitrate medications. It is recommended to choose the appropriate medication program according to the patient’s own situation under the guidance of the physician, and should not be used blindly.