Antibiotics are a medication used for treating bacterial infections. They can work to prevent or stop the spreading of an infection. Antibiotics are available in many types. Some of these are broad-spectrum, meaning they can treat different disease-causing bacteria. Others are able to kill specific forms of bacteria. While antibiotics are effective and important for treating many serious infections, they also cause some side effects. Taking these medications excessively would cause liver damages. Also, antibiotics could affect gut bacteria and microbes. In the long term, this might increase the risk of obesity and weight gain. More importantly, antibiotic resistance is a significant problem when you take the medications over the long run.