Click Here To Buy Now Sildenafil 120 is a medication used to treat erectile dysfunction (ED) and contains 120 mg of sildenafil citrate. This dosage is a bit higher than the standard 100 mg found in many other ED medications but lower than the 200 mg dosage in Sildenafil 200.Sildenafil 120 contains 120 mg of sildenafil citrate. This is generally considered a higher dose, and should be taken based on the guidance of a healthcare provider to ensure safety and effectiveness.