Cenforce 100 has the same blue color as Viagra and has the same form as Parallelogram, which is commonly referred to as a "Blue Pill" or "Little Blue Pill." Phosphodiesterase type 5 (PDE5) inhibitors are a pharmacological family of pharmaceuticals that includes Generic Viagra. It causes blood vessels to dilate and smooth muscle to relax in the vaginal region of the body. It relaxes the muscles and blood vessels, allowing more blood to flow to the penis and maintaining a man's sexual excitement.