Viagra is also known as sildenafil citrate tablets, the main ingredient is sildenafil citrate, clinically, you can choose tadalafil tablets and other drugs alternative use. Sildenafil citrate tablets are a kind of for blue film-coated tablets, suitable for the treatment of erectile dysfunction, the main ingredient is sildenafil citrate. Nitrates, PDE5 inhibitors and other drugs should be avoided, and the use of sildenafil citrate is prohibited in patients who are allergic to its ingredients. If Sildenafil Citrate tablets are not available, Tadalafil tablets can be chosen for treatment instead. The main ingredient of this drug is tadalafil, which is used for the treatment of erectile dysfunction combined with benign prostatic hyperplasia and so on. The combination of nitrates such as guanylate cyclase stimulators should be avoided clinically, and the use of tadalafil is prohibited in patients who are allergic to tadalafil. Patients should use sildenafil citrate tablets and other drugs under the guidance of a professional doctor to avoid blind use of drugs causing adverse reactions.