Aminoglycoside antibiotics are synergistically effective when combined with which class of antibiotics?

• A. Fluoroquinolones
• B. Macrolides
• C. Penicillins
• D. Tetracyclines

Answer: (C)

Aminoglycoside antibiotics are known to have a synergistic effect when combined with beta-lactam antibiotics, such as penicillins. This synergy primarily occurs because the beta-lactam antibiotics weaken the bacterial cell wall, making it easier for the aminoglycosides to penetrate the bacterial cell and exert their effect. Aminoglycosides require active transport into the bacterial cell, which is facilitated by the disruption of the cell wall caused by beta-lactams.

This combination is particularly effective against certain Gram-negative bacteria, such as Pseudomonas aeruginosa and Enterobacter species, where the enhanced penetration and bacterial killing result in a greater therapeutic effect than either class of antibiotics might achieve alone. The use of this synergistic approach is also a strategy to combat antibiotic resistance and enhance treatment outcomes in serious infections.