Moving on, although each brand of enlargement pill has its own possible set of side effects, there are a few common results that occur from using most of the said products. These include noticeable pain that is usually prevalent in the stomach and/or in the chest. If after ingesting an enlargement pill, you feel a sharp ache in your stomach or notice a pain in your front upper body, you need to stop the medication at once and seek help. In addition, another more severe side effect which enlargement pills may have concerns the weakening or even the loss of your eyesight. You may feel other side effects apart from the previously mentioned examples, therefore, it is very important that you carefully decide if you still would like to continue using such products.