Penicillin has been viewed as one of the “miracle drugs” of the 21st century. Prior to the invention of this drug many people were dying from bacterial infections that are currently treated with a simple visit to your doctors office. In the body Penicillin works through a very complex mechanisms that has been discovered with years of research. In this text I elucidate this mechanism and give readers a better understanding of Penicillin and its effects in the human body.