Antibacterials Flashcards
Drugs that inhibit cell wall synthesis
penicillins, vanomycin, carbapenems and cephalosporin
Drugs that affect protein synthesis
macrolides, tetracycline, and aminoglycosides
Drugs that affect transcription mechanisms
FQs
Drugs that affect metabolic pathways
sulfamethoxazole and trimethoprim
is sulfamethoxazole bactericidal or bacteriostatic
bacteriostatic because is is an antimetabolite
sulfamethoxazole is always sombined with
trimethoprim
Mechanism of sulfamethoxazole
prevents synthesis of folic acid
major use of sulfamethoxale
UTIs and otitis media
Do not use sulfamethoxazole in?
pregnant women, breastfeeding women or infants under 2 months of age
Rare side effect of sulfamethoxazole?
stevens johnson syndrome
Are beta lactam antibiotics bacteriostatic or bacteriocidal?
bacteriocidal because they cause lysis and death
3 groups of beta lactam antibiotics?
penicillins, cephalosporins and carbapenems
beta lactam antibiotics interfere with
cell wall synthesis
oral penicillin?
penicillin V
IV penicillin?
penicillin G
penicillins are active against?
most gram positive and some gram negative
what type of cell wall is more difficult to treat with antibiotics?
gram negative because it has 3 layers. the outer membrane is difficult to penetrate.
beta lactamase
enzyme produced by bacteria that destroys the beta lactam ring which is critical for drug activity
use penicillins with _______ to prevent penicillinase
clavulanic acid
Most common adverse effect with penicillins
allergy
cephalosporins and pharmacologically and structurally related to
penicillins
are cephalosporins bactericidal or bacteriostatic?
bactericidal because they cause lysis of the bacteria
as there is progression from 1st generation cephalosporins to 5th generation there is?
- increased activity towards gram negative
2. better ability to resist destruction by beta lactamases
Best generation of cephalosporins for gram positive coverage
first generation
first generation cephalosporins are used for?
surgical prophylaxis, URIs and otitis media
first generation cephalosporins have?
excellent gram positive coverage
Second generation cephalosporins do not?
kill anerobes
second generation cephalosporins have?
good gram positive coverage and better gram negative coverage then 1st generation
What is the most potent cephalosporin group for gram negative bacteria?
third generation
third generation cephalosporins can?
easily pass the meninges and diffuse into CSF for treatment of meningitis
Which generation of cephalosporins have the greates spectrum for gram positive?
fourth generation
fifth generation cephalosporins are used for?
MRSA infections