Fildena 150 mg tablets are part of the Sildenafil Citrate family of medication, which are used to treat erectile dysfunction in men. Since they were first introduced in the market by Ajanta Pharma in India, they have become one of the most used erectile dysfunction medications worldwide. The active ingredient, Sildenafil citrate, works by relaxing blood vessels in the penis so that more blood can flow into it and help improve an erection when sexually aroused.