"Narrow spectrum" refers to a type of medication, particularly antibiotics, that is effective against a limited range of bacteria. These drugs target specific types of bacteria, minimizing the impact on beneficial bacteria in the body. This selectivity helps reduce the risk of developing antibiotic resistance and preserves the natural microbiome. In contrast to broad-spectrum antibiotics, which can affect a wide variety of bacteria, narrow-spectrum antibiotics are often preferred for treating specific infections. Examples of narrow-spectrum antibiotics include penicillin and vancomycin, which are used to treat infections caused by specific bacterial strains.