Sildisoft tablets are a generic medication used to treat erectile dysfunction (ED) in men. The active ingredient in these tablets is Sildenafil citrate, the same compound found in the brand-name drug Viagra. Sildenafil belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the penis during sexual arousal, allowing a man to achieve and maintain an erection.