Viagra drug generic name is sildenafil citrate, which increases the hardness during erection but does not prolong it. Non-lasting is a premature ejaculation problem and Dapoxetine should be used. Sildenafil citrate increases blood flow to the penis during erection, improves erectile function and increases the hardness of erection. However, this drug does not prolong the latency of ejaculation and is not effective for premature ejaculation. Its adverse reactions include flushing, visual abnormalities, headache, dizziness, and rash, and it is contraindicated in patients who are allergic to sildenafil and cannot be combined with nitrate. If there is a problem of sexual life is not lasting, we recommend the use of Dapoxetine for treatment, in general, after the use of a certain degree of prolongation of sexual life time. It is recommended to use the drug under the guidance of the doctor according to their own situation, should not blindly take the drug, so as not to affect the therapeutic effect.