Kamagra 50 mg contains sildenafil, a medicine used to treat erectile dysfunction. It can sometimes cause a prolonged erection because it increases blood flow to the ***** and helps maintain an erection during ***** stimulation. Why can Kamagra cause a prolonged erection? Relaxation of blood vessels: Sildenafil blocks an enzyme called PDE5, helping blood vessels in the ***** relax and allowing more blood to flow in. Delayed loss of erection: It helps maintain the erection response for longer after ***** stimulation. Individual sensitivity: Some people respond more strongly to sildenafil than others. Drug interactions or excessive doses: Taking more than prescribed or combining it with certain other medicines can increase the risk of adverse effects. An important distinction: sildenafil does not normally cause a continuous erection for the entire time it remains active in your body. Its effects can last several hours, but an erection should generally subside after ***** stimulation ends. A prolonged erection that lasts 4 hours or more may be a condition called priapism. It is a medical emergency because it can damage penile tissue and cause permanent erectile problems if treatment is delayed. Seek emergency medical care immediately if this happens, even if it is not painful. 11012 +1 Important: Do not combine Kamagra with Tazzle 10 mg (tadalafil), Viagra, or other erectile dysfunction medicines unless a doctor specifically directs you to do so. One question: Are you asking because you want to understand the medicine, or are you currently experiencing an erection that is lasting longer than usual? If it has already lasted 4 hours, go to an emergency department now.