Which class of antibiotics includes clindamycin, aminoglycosides, tetracycline, chloramphenicol, and macrolides?

• A. Protein Synthesis Inhibitors
• B. Cell Wall Synthesis Inhibitors
• C. Metabolic Pathway Inhibitors
• D. Nucleic Acid Synthesis Inhibitors

Answer: (A)

These drugs share a common target: they disrupt bacterial protein synthesis by binding to parts of the ribosome, rather than attacking the cell wall, metabolic pathways, or nucleic acid synthesis.

Aminoglycosides and tetracyclines act on the 30S subunit. Aminoglycosides cause misreading of mRNA and block initiation, while tetracyclines prevent access of aminoacyl-tRNA to the ribosome’s A site, stopping elongation. The others—macrolides, chloramphenicol, and clindamycin—target the 50S subunit but by different mechanisms: macrolides block translocation, chloramphenicol inhibits peptidyl transferase, and clindamycin interferes with peptide bond formation at the 50S site.

Because all of these inhibit protein synthesis, they belong to the Protein Synthesis Inhibitors class. They do not primarily inhibit cell wall synthesis, metabolic pathways, or nucleic acid synthesis.