Kamagra 100 mg Tablet belongs to the PDE5 inhibitor class of medicines. It works by relaxing the blood vessels in your penis. When sexually stimulated, blood flows into the penis, causing an erection. This medicine will only help you have an erection if you're sexually stimulated. It works well, but it must be taken at least 30 minutes before sexual activity.  Kamagra 100 mg Tablet is a prescription drug used to treat male impotence (erectile dysfunction). It increases the flow of blood to the penis. This helps men acquire and maintain an erection. It belongs to the phosphodiesterase type 5 (PDE 5) inhibitor class of medicines.