Fildena 100 Mg Tablets, which contain sildenafil, are meant to be taken orally, along with a moderate amount of water. Twenty milligrams is the maximum amount of sildenafil that is advised for ED and impotence. So, a single pill can be used three times with a pill cutter. Foods high in fat, drinks with a lot of alcohol, and grapefruit should be avoided as they have been shown to decrease efficacy. Nothing that is wet or warmer than room temperature should be stored.