Hi, in the past disease could kill people easily because there was no medicine science like today and most of cure and treatment was base on herbs or foods. But during the time developments in the medicine and medical science bring new drugs for treating disease. One of the most important discoveries was penicillin which was discovered by Alexander Fleming in 1912 and it was a powerful drug for stopping and removing infection in the body of patients known as antibiotics. And here we have a video about mechanism and classification of antibiotics. Let's watch video about to learn about mechanisms of antibiotics.