Taking tadalafil tablets may work for some patients in 2 to 3 treatments, but the actual situation everyone is in is different and the sensitivity of the drug varies from person to person, so will the specific treatment and dosage needed. Tadalafil is a PDE-5 inhibitor used to treat erectile dysfunction in men. There is no course of treatment when the drug is taken as needed. When taking the drug daily, some doctors will take a week as a course of treatment, and observe the treatment effect after taking the drug continuously for 2~3 weeks, and some patients may be able to achieve more obvious effect at this time. However, due to the different reaction of each person to the drug, some will not appear obvious effect. Common adverse reactions to the drug include headache and indigestion, and some patients may experience eye pain and conjunctival congestion. Patients who are allergic to tadalafil and its prescribed ingredients should not take this product, and patients who are taking any form of nitrate medication are not allowed to take tadalafil tablets. It is important to note that patients with mild and moderate liver damage are advised to take tadalafil with caution, while tadalafil should not be used in patients with severe liver damage, as well as in women and children. The drug should be applied in strict compliance with medical advice.