Sildalist Strong 140 mg is a medication used to treat erectile dysfunction (ED) in men. It is a combination medication that contains two active ingredients: sildenafil citrate and tadalafil. Sildenafil citrate is a phosphodiesterase type 5 (PDE5) inhibitor, which works by increasing blood flow to the penis, thereby helping to achieve and maintain an erection during sexual stimulation. It is the same active ingredient found in medications like Viagra. Tadalafil is also a PDE5 inhibitor used to treat erectile dysfunction. It works similarly to sildenafil citrate but has a longer duration of action, allowing for up to 36 hours of effectiveness. Tadalafil is the active ingredient in medications like Cialis.