Antimicrobials 5-6 Flashcards
toxic systemically: mostly used topically except for vancomycin
Polypeptide Antibiotics & Other Antibiotics
What are the Polypeptide Antibiotics
Vancomycin
Bacitracin
What are the other antibiotics
Fosfomycin
Cycloserine
inhibits transglycosylation
MOA of Vancomycin
Its S/E is Red Man Syndrome
Vancomycin
produced by the Tracy-I strain of Bacillus subtilis
Bacitracin
Has a S/E of psychologic and neurologic
Cycloserine
use: UTI caused by E.coli
Fosfomycin
binds to the lipid carrier bactoprenol
MOA of Bacitracin
Sexond line drug for TB
Cycloserine
S/E: highly nephrotoxic and hematotoxic - not used systemically, only topically
Bacitracin
DOC: “last line® for MRSA (IV) and C. difficile-induced pseudomembranous colitis (PO)
Vancomycin
both mammalian and bacterial cells have plasma membrane - toxic if systemic clinical use is mostly limited to topical applications
Nonselective
bind to the LPS or phospholipids of the cell membrane, increasing membrane permeability >- loss or leakage of cell constituents
MOA of Polymyxins
“reserve drug due to nephrotoxicity and ototoxicity
Vancomycin
Also know as Colistin
Polymyxin E
from Bacillus polymyxa
Polymyxin B
A Polymyxin B for skin infections
+ Bacitracin
A Polymyxin B for eye infections
+ Dexamethasone and Neomycin:
from Aerobacillus colistinus
Polymyxin E
What are the polymyxin drugs
Polymyxin E
Polymyxin B
use: reserve agent for skin and soft tissue infections (SSTIs)
Daptomycin
vital for protein synthesis
Ribosomes
given IV except for neomycin (topical&oral)
Aminoglycosides
most widely used in combination with B-lactam antibiotics in serious infections with G(-) bacteria
Aminoglycosides
Aminoglycosides + penicillin =
synergism
Its S/E are ototoxicity & nephrotoxicity
Aminoglycosides
S/E: Ototoxcity most nephrotoxic
Neomycin, Tobramycin, and Gentamicin
S/E: Ototoxcity most vestibulotoxic
Streptomycin and Gentamicin
S/E: Ototoxcity most cochleotoxic
Kanamycin, Amikacin, and Neomycin
What to give to reverse the effect of neuromuscular blockade (neuromuscular paralysis) (or neostigmine)
calcium gluconate
T/ F. The addition of furosemide in aminoglycosides will increased risk of ototoxicity
True
S. griseus
Streptomycin
semisynthetically derived from Kanamycin. first prepared in Japan
Amikacin
S. kanamyceticus
Kanamycin
S. tenebravius
Tobramycin
S.fradiae
Neomycin
1st effective agent against TB
Streptomycin
1st aminoglycoside discovered
Streptomycin
derived from Streptomyces spp. and Micromonospora spp.
Aminoglycosides
What are the 305 Inhibitors
Aminoglycosides and Tetracyclines
cyclic lipopeptide from Streptomyces roseosporus
Daptomycin
antibacterial activity is enhanced by zinc
Bacitracin
inhibits UDP-N-Acetylglucosamine enolpyruvyl transferase (MurA)
MOA of Fosfomycin
Bacitracin antibacterial activity is enhanced by
Zinc
due to administration of expired tetracycline
Fanconi-like syndrome
Very long acting tetracycline
Tigecycline
Its S/E is teeth discoloration and stunting of growth
Tetracyclines
consists of 4fused rings with a system of coniugated double bonds
Tetracyclines
from Streptomyces aureofaciens
Chlortetracycline
Interraction of tetracycline to penicillin
Antagonistic
chelation withsubstances (dairy products, drugs, and supplements) containing metal(s)
decreased absorption of tetracycline
broadest spectrum of the antibiotics
Tetracyclines
teeth discoloration
“mottled enamel”
-effective against many G(+), G(-), spirochetes, and atypical bacteria
Tetracyclines
DOC: Lyme disease & infections caused by Rickettsia
Tetracycline
T/F. Tetracycline has a S/E of photosensitivity
True
Short acting tetracycline
Tetracycline, Oxytetracycline
Long acting tetracycline
Doxycycline, Minocycline
Intermediate acting tetracycline
Methacycline, Demeclocycline