A single dose of tadalafil is usually metabolized after 36 hours. Therefore, if you experience discomfort after taking the drug, you will usually recover in about 2 to 4 days. Tadalafil can increase penile blood flow, improve erectile function, mainly used in the treatment of erectile dysfunction. It usually takes 36 hours for the body to completely metabolize the drug, so if some discomfort occurs after using the drug, it will usually return to normal in about 2~4 days after using the drug. Adverse reactions that often occur with the use of this product include headache, dyspepsia, back pain, myalgia, flushing, etc. It is contraindicated for those who are allergic to this product and those who are taking nitrate drugs. Please use the drug under the guidance of a physician according to the situation, and should not take the drug blindly.