Antibiotics: Inhibitors of Protein Synthesis Flashcards
Macrolides MOA
Bind the 50 s subunit irreversibly.
Macrolides spectrum
Gram positives. Bacteriostatic.
Macrolides elimination
fecal.
Macrolides resistance
efflux pumps and methylation of the drug binding site.
Macrolides toxicity
Diarrhea (erythro), QT pronlongation, hepatotoxicity and drug interactions (CYP 3A4)
Erythromycin
Macrolide. Oral/IV. Has immense GI effects and drug interactions.
Clarithromycin (biaxin)
Macrolide. Oral. Least GI disturbance but still has drug interactions.
Azithromycin (zithromax)
Macrolide. Oral/IV. Has some GI disturbances but has the least drug interactions.
Chlamydia DOC
Azithromycin or tetracycline
Ketolides: Telithromycin (ketek) MOA
Binds the 50S subunit with great affinity.
Telithromycin (ketek) spectrum
broad spectrum. Bacteriostatic. Good for erythromycin/penicillin resistant respiratory pathogens like pneumococci.
Telithromycin (ketek)
Ketolide. Oral.
Telithromycin (ketek) toxicity
Diarrhea, hepatotoxicity, drug interactions (CYP3A4).
Clindamycin (cleocin) MOA
Reversibly binds the 50S subunit.
Clindamycin spectrum
Aerobic gram positives and some anaerobic gram negative and positive organisms. Can be used for strep and staph infections (MRSA). Static or cidal depending on the concentration.
Osteomyelitis DOC
Clindamycin
Toxic Shock DOC
Clindamycin
Toxoplasma encephalitis DOC
Clindamycin
Clindamycin toxicity
pseudomembranous colitis (C-Diff). Hepatotoxicity. Crosses the placenta and breast milk.
Streptogramins
Dalfopristin;Quinupristin (synercid)
Synercid MOA
Blocks ribosome function. Dalfo in the early phase and Quin in the late phase. Bactericidal.
Synercid
Streptogramin. Dalfopristin;Quinupristin. IV.
Synercid toxicity
GI disturbance and drug interactions (CYP3A4)
Oxazolidinone
Linezolid (zyvox)