Antibiotics are supposed to make you feel better and attack bacteria that are present in the body. There are a few different types of antibiotics that doctors can prescribe, the most common being penicillin. Even though most antibiotics do help you, there are a few things that you should know about the impacts that they can have on the body. One is that some antibiotics can cause diarrhea, which usually occurs if you are taking multiple antibiotics at one time. Penicillin is known for causing diarrhea as well. Some antibiotics will drain the energy that you have in the body as they work to get rid of the bacteria that is present. They can also change the color of your urine. Most antibiotics work against bacteria that replicate. The medications are fairly good at determining what is good bacteria and what needs to be killed off. Some of the good bacteria in the body is found in the digestive tract. Your doctor might prescribe other medications to keep the acid in the stomach to a minimum while the antibiotics work to get rid of any bacteria that is harming the body. It’s important to take all of the antibiotics that are prescribed because some bacteria can survive and further replicate, which means that it can become resistant to medications.