Why are broad-spectrum antibiotics sometimes started first?

• A. While awaiting C&S results
• B. Because they are cheaper
• C. Because they only treat viruses
• D. Because they have no side effects

Answer: (A)

Starting broad-spectrum antibiotics first is about providing immediate coverage when you don’t yet know which organism is causing the infection. Culture and susceptibility results take time, and delays in treatment can allow the infection to worsen. An empiric broad-spectrum approach aims to cover the most likely bacteria until the exact pathogen and its sensitivities are known. Once results return, therapy can be narrowed to a targeted antibiotic to minimize unnecessary exposure, resistance, and side effects. The other options aren’t correct because cost isn’t the primary reason for empiric therapy, antibiotics don’t treat viruses, and broad-spectrum drugs can have significant side effects.