Sildalist is a medication used to treat erectile dysfunction (ED) in men. It is a combination drug that contains two active ingredients: Sildenafil Citrate (the active ingredient in Viagra) and Tadalafil (the active ingredient in Cialis). Both are phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the penis to help achieve and maintain an erection during sexual stimulation