Fildena 100 mg is an oral medication that should be consumed whole, with or without food, with water. It is sometimes recommended that you keep the pill under your tongue. Follow your doctor's directions to the letter. 30-60 minutes before sexual activity, take the Sildenafil Citrate Tablets. Its effects last for 4-6 hours after being ingested. Fildena 100 is a GMP-specific type 5 phosphodiesterase inhibitor that is circulating in the bloodstream. Similar ED pills: Vidalista 40 mg