Long-term use of antibiotics does not enhance the body's immunity. Amoxicillin is one such antibiotic, primarily used to treat bacterial infections caused by various susceptible pathogens. It's important to mention "susceptible pathogens" here because whether it's amoxicillin or other antibiotics, although most are broad-spectrum, the world of microbes is vast. Each antibiotic has a specific range of pathogens it can effectively combat. No single drug can fight all pathogens. Therefore, if there is a bacterial infection that can be effectively treated by amoxicillin, it's appropriate. However, if the bacteria are not sensitive to amoxicillin or have developed resistance, then taking amoxicillin won't be effective.