Final answer:
Narrow spectrum drugs target specific bacteria, minimizing damage to beneficial microbiota and reducing the risk of antibiotic resistance and superinfections compared to broad spectrum drugs.
Step-by-step explanation:
The benefit of narrow spectrum drugs over broad spectrum drugs is that they minimize damage to the body's normal microbiota and decrease the risk of promoting antibiotic resistance. Narrow spectrum drugs are designed to target specific types of bacteria, which makes them more precise in treating infections caused by those pathogens. This precision helps preserve beneficial bacteria in the body that broad spectrum drugs may inadvertently destroy, reducing the chance of superinfections like candidiasis and pseudomembranous colitis. Furthermore, using narrow spectrum drugs in the first instance can prevent the development of resistant bacteria, since broad spectrum drugs tend to kill off susceptible bacteria while allowing resistant strains to thrive.