Kamagra Oral Jelly is a medication that is often used as a treatment for erectile dysfunction (ED). It contains the active ingredient sildenafil citrate.It increases blood flow to the penis to help men get an erection. At least two-thirds of men have improved erections after taking it. Kamagra is in a class of medications called phosphodiesterase (PDE) inhibitors.which is the same ingredient found in Viagra. The jelly form of the medication is designed to be easier. This increased blood flow can cause an erection. Kamagra treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily.