This is a Film-coated tablet. Blue film-coated, round tablets debossed with 'M' on one side and 'SL over 25'. Sildenafil usually lasts for 4-6 hours at full potency. You'll continue to get some effect all the time there's some in your bloodstream, so it can still produce results past that point. Exactly how long sildenafil stays in your body will depend on individual factors, such as your size, health and age.