Tadalafil is a drug used to treat erectile dysfunction in men, it can’t be used to treat premature ejaculation, it needs sexual stimulation to be effective, patients with premature ejaculation can take Dapoxetine under the guidance of the doctor for treatment. The main role of tadalafil is to treat male erectile dysfunction, through selective inhibition of PDE5, enhancement of nitric oxide (NO)-cGMP pathway, elevated cGMP levels and lead to the relaxation of penile cavernous smooth muscle, so that patients with erectile dysfunction to sexual stimulation to produce a natural erectile response. Thus, better erection hardness is maintained. Reactions such as flushing, nausea and vomiting may occur after taking Tadalafil, which usually disappear on their own if the symptoms are not serious. 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. The drug should be taken correctly under the guidance of a doctor to avoid unauthorized use and damage to the body.