Sildenafil tablets can improve sexual dysfunction in men. This drug mainly improves erectile dysfunction and has no effect on time extension. Sildenafil is a phosphodiesterase inhibitor, which can release nitric oxide and relax the smooth muscle of the penis, allowing more blood to flow into the penis, thus improving erectile dysfunction in men. However, sildenafil requires sexual stimulation to work therapeutically, and cannot work without it. The following points need to be noted when using sildenafil tablets: 1. Patients suffering from cardiovascular system diseases need to use the drug with caution; 2. Sildenafil tablets may cause hypotensive reactions in patients, especially for patients with a previous history of hypotension, and are not recommended; 3. If patients are also taking nitrates, the use of this drug is also not recommended.