Broad-spectrum antibiotics are medications that can target a wide range of bacteria, both gram-positive and gram-negative. They are often used when the specific bacteria causing an infection are unknown, allowing for effective treatment of various infections. Common examples include amoxicillin and tetracycline. These antibiotics work by disrupting essential processes in bacteria, such as cell wall synthesis or protein production. While they are effective against many types of bacteria, their use can also lead to antibiotic resistance and disrupt the body's natural microbiome, making it important to use them judiciously.