Sildigra 250 is generally known as a brand of generic Viagra, and it usually contains sildenafil citrate as its active ingredient. Sildenafil citrate is a phosphodiesterase type 5 (PDE5) inhibitor, commonly used to treat erectile dysfunction (ED) in men. It works by increasing blood flow to the penis during sexual stimulation, allowing for an erection. The dosage strength of 250 mg seems unusually high compared to standard doses of sildenafil. The usual recommended doses for sildenafil are in the range of 25 mg to 100 mg, taken about 30 minutes to an hour before sexual activity.