Kamagra Chewable Tablet can cause a prolonged erection when its active ingredient, sildenafil, keeps blood flowing into the ***** longer than normal. This is a rare but serious side effect called priapism. Kamagra is marketed as a sildenafil product, but products sold under this name may not always have verified ingredients or reliable dosing. When can it happen? After taking the tablet: A prolonged erection can develop within a few hours after taking it, while the medicine is active. After ***** stimulation: Sildenafil helps produce and maintain an erection in response to ***** stimulation, but an erection should normally subside after stimulation ends. With higher doses or certain drug combinations: The risk may increase with excessive sildenafil use or when combined with other erection medicines or certain drugs that affect its breakdown. Even at a usual dose: Priapism can occur rarely even when the medicine is taken as directed.