Viagra is the trade name and the generic name is Sildenafil Citrate Tablets. Sildenafil Citrate Tablets are generally effective for most patients with erectile dysfunction, but the specific efficacy of the treatment cannot be generalized due to the different constitution of individuals. Sildenafil Citrate Tablet is a type 5 phosphodiesterase inhibitor that can treat erectile dysfunction. If you suffer from erectile dysfunction, you can take the drug under the guidance of a doctor, which is effective in treating the disease. However, due to the variability of some patients’ physique, the efficacy of taking the drug may be poor and cannot be generalized. Adverse effects of Sildenafil Citrate Tablet include headache, flushing, indigestion, back pain, dizziness, nausea, and fatigue. People who are allergic to the ingredients of Sildenafil Citrate Tablet, as well as pregnant women, need to refrain from taking this medication. If patients have the need to use sildenafil citrate tablets, they should combine their own situation, ask the doctor’s guidance, do not take medication without authorization, in order to avoid damage to health. Daily need to keep the perineum clean and dry, to avoid secondary infection.