Sildenafil Citrate is mainly effective in improving penile erectile dysfunction. Sildenafil Citrate belongs to type 5 phosphodiesterase inhibitors, through selective inhibition of PDE5, enhance the nitric oxide (NO)-cGMP pathway, elevate the cGMP level and lead to the relaxation of penile corpus cavernosum smooth muscle, so that patients with erectile dysfunction to produce a natural erectile response to sexual stimulation. Common adverse reactions to Sildenafil Citrate Tablets mainly include headache, flushing, dizziness, nasal congestion, indigestion, and visual abnormalities. The drug is forbidden to be used in combination with nitrate drugs, and it is contraindicated for women, those who are allergic to the product, children, and those whose recent cardiovascular status makes them unfit for sexual intercourse. Sildenafil citrate should be used correctly under the guidance of a doctor, do not use the drug privately and blindly.