Sildisoft tablets are used to treat erectile dysfunction (ED). They contain sildenafil citrate, the same active ingredient found in Viagra. Sildisoft tablets work by increasing blood flow to the penis during sexual stimulation. Sildenafil citrate, the active ingredient, inhibits the enzyme phosphodiesterase type 5 (PDE5), which leads to the relaxation of blood vessels in the penis and helps achieve and maintain an erection.