Sildalist Strong 140 mg is a medication that combines two active ingredients: sildenafil citrate and tadalafil. Sildenafil citrate and tadalafil are both medications used to treat erectile dysfunction (ED) in men. Tadalafil also belongs to the PDE5 inhibitor class of medications. It works in a similar manner to sildenafil citrate, but its effects last longer. Tadalafil is known for its longer duration of action, which can last up to 36 hours. It is the active ingredient in medications like Cialis.