Taking tadalafil does not prolong the time for normal people. Tadalafil belongs to the drugs to improve erectile function, mainly by increasing the blood supply to the penis to improve the hardness and time of penile erection, tadalafil can not prolong the time of ejaculation in normal men, and does not have any significant effect on normal people. And normal people should not take the drug at will, the drug is to treat the disease, there is no disease in the case of taking drugs may cause adverse effects on the body. The use of tadalafil may cause adverse reactions such as headache, back pain, indigestion and so on. Tadalafil is contraindicated in people who are allergic to any of the ingredients in the product, patients who are taking any form of nitrates, guanylate cyclase stimulators, women, children and other people. Tadalafil is not recommended for men if they can have normal erections. If men have erectile dysfunction, it is recommended to take the drug under the guidance of a doctor.