Sildenafil citrate tablets can effectively improve male sexual function and have a more pronounced improvement in erectile dysfunction of the penis. This drug can promote the release of nitric oxide, thus increasing the activity of the enzyme, which can relax the smooth muscle of the penile corpus cavernosum and allow more blood to flow into the penis, thus improving the erectile dysfunction. This drug is usually taken one hour before sex and can have a better therapeutic effect. The drug needs to be sexually stimulated to work. It is important to note that without sexual stimulation, this drug will not work. Sildenafil Citrate Tablets should be used with caution in patients with cardiovascular disease, especially in patients with hypotension, as this drug may cause hypotensive reactions in patients.