MRCEM Notes

Antibiotics: protein synthesis inhibitors

DrugMechanism of actionAdverse effectsNotes
AminoglycosidesBinds to 30S subunit causing misreading of mRNANephrotoxicity, Ototoxicity
TetracyclinesBinds to 30S subunit blocking binding of aminoacyl-tRNADiscolouration of teeth, photosensitivity
ChloramphenicolBinds to 50S subunit, inhibiting peptidyl transferaseAplastic anaemia
ClindamycinBinds to 50S subunit, inhibiting translocation (movement of tRNA from acceptor site to peptidyl site)Common cause of C. difficile diarrhoea
MacrolidesBinds to 50S subunit, inhibiting translocation (movement of tRNA from acceptor site to peptidyl site)Nausea (especially erythromycin), P450 inhibitor, prolonged QT intervalCommonly used for patients who are allergic to penicillin



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