What is one consequence of using broad spectrum antibiotics unnecessarily?

Using broad spectrum antibiotics unnecessarily can lead to more adverse side effects because these medications affect a wide range of bacteria, including both harmful pathogens and beneficial microorganisms that reside in the body. This disruption of the normal microbiota can result in various complications, such as gastrointestinal issues, yeast infections, and an increased risk of antibiotic resistance. By killing off beneficial bacteria, the balance of the microbiome is disturbed, which can lead to secondary infections or overgrowth of opportunistic organisms that the normal flora would typically keep in check. Therefore, while broad spectrum antibiotics can be critical in treating serious infections, their inappropriate use can have significant negative impacts on a patient's health.