Silagra 25 mg is commonly prescribed to help with erectile dysfunction, but it also has a role in treating pulmonary arterial hypertension (PAH). This medication works by relaxing the muscles in the penis, which boosts blood flow and helps men achieve and maintain an erection. However, it's important to note that Silagra doesn't offer protection against sexually transmitted diseases. Your doctor may also prescribe this medicine for other conditions as needed.