Sildisoft tablets contain the active ingredient sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction (ED) in men. These tablets are a generic version of Viagra and work in the same way as the branded medication. Sildenafil citrate works by increasing blood flow to the penis during sexual stimulation, which helps men achieve and maintain an erection sufficient for sexual activity. It does this by inhibiting the enzyme PDE5, which is responsible for regulating blood flow in the penis.