Cenforce 100 is a weight loss pill that works by increasing the body's metabolism. By increasing the body's metabolism, the user experiences a quick and consistent weight loss. The downside to Cenforce 100 is that it also includes Viagra in the ingredient list. Viagra is a prescription item, and the amount you are allowed to take with your Cenforce 100 depends on your doctor. Some people experience side effects like dry mouth, anxiety, headaches and upset stomach when taking Viagra as a replacement for Cenforce.