Eriacta 100 mg is a medication primarily used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil citrate works by increasing blood flow to the penis during sexual stimulation, allowing for an erection to occur. The active ingredient in Eriacta 100 mg is sildenafil citrate, which is the same active ingredient found in Viagra. Sildenafil citrate works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which regulates blood flow in the penis. By inhibiting PDE5, sildenafil citrate helps to relax the blood vessels in the penis, allowing for increased blood flow and the attainment of an erection.