By boosting the flow of blood to the penis, sildenafil pills can treat erectile dysfunction. This drug, Kamagra gel, functions by blocking the PDE5 enzyme. When sexually excited, this inhibition raises the amount of cyclic Guanosine Monophosphate (cGMP), which improves penile blood flow and aids in achieving and sustaining an erection. Your doctor may also prescribe Kamagra to treat Benign Prostatic Hypertrophy (enlarged prostate) and Pulmonary Arterial Hypertension (PAH).