antibiotics, antiseptics, disinfectants E3 Flashcards
aminoglycosides: bacteriostatic/cidal?
bactericidal
beta-lactams: bacteriostatic/cidal?
bactericidal
fluoroquinolones: bacteriostatic/cidal?
bactericidal
- cause breaks in bacterial DNA: lethal if unrepaired
vancomycin: bacteriostatic/cidal?
bacteridical
rifampins: bacteriostatic/cidal?
bactericidal
metronidazole: bacteriostatic/cidal?
bactericidal
tetracyclines: bacteriostatic/cidal?
bacteriostatic
macrolides: bacteriostatic/cidal?
bacteriostatic
sulfa drugs: bacteriostatic/cidal?
bacteriostatic
clindamycin: bacteriostatic/cidal?
bacteriostatic
fluoroquinolones: target
DNA gyrase, topoisomerase IV
rifampins: target
RNA polymerase
metronidazole: target
produces compounds toxic to DNA –> inhibits nucleic acid synthesis
sulfa drugs: target
inhibits folic acid synthesis
fluoroquinolones: spectrum of activity
broad spectrum
community-acquired pneumonia: common empirical treatment
levofloxacin or moxifloxacin
rifampins: target
RNA polymerase
metronidazole: target/mechanism
DNA: produces free radicals that are toxic to DNA
sulfanilamide: analog of, target/mechanism
- sulfa drug that is an analog of PABA
- targets folic acid synthesis: no folic acid = no bacterial growth
trimethoprim: analog of, target/mechanism
analog of DHF: binds DHF reductase, blocks formation of folic acid
sulfa/folic acid synthesis inhibitors: spectrum
broad, however resistance is rising
vancomycin: mechanism of action, target
- targets cell wall synthesis
- binds D-alanine dimer at end of crosslinking peptide of bacteria
vancomycin: spectrum of activity
gram +
beta-lactam antibiotics: mechanism of action
inhibit transpeptidases (penicillin binding proteins)
stops cross-linking, weakens cell wall
penicillins: spectrum
very broad: both gram +, gram -
aminoglycosides: spectrum
broad: mostly gram -
inactive against anaerobes
aminoglycosides, tetracyclines: mechanism of action
blocks protein synthesis by binding 30S subunit
usually bactericidal
tetracyclines: spectrum
broad
good for intracellular
linezolid spectrum
gram + only
macrolides, linezolid, clindamycin: mechanism of action
blocks protein synthesis by binding 50S –> inhibits transpeptidation
alcohols: disinfectant or antiseptic
both
alcohols: kill
everything but spores
hydrogen peroxide: disinfectant or antiseptic
disinfectant
hydrogen peroxide: kills
everything: can kill spores
chlorine: disinfectant or antiseptic
disinfectant
chlorine: kills
everything, including some spores
iodophors: disinfectant or antiseptic
both
iodophors: kill
bacteria, fungi, viruses
some mycobacteria
does not kill spores
chlorohexidine: disinfectant or antiseptic
antiseptic
chlorohexidine: kills
everything but spores
staph aureus treatment
MSSA: nafcillin
MRSA: vancomycin
staph epidermidis treatment
vancomycin w/ rifampin or gentamycin
staph saprophyticus treatment
penicillin
strep pyogenes treatment
penicillin
strep agalactiae treatment
penicillin
strep pneumoniae treatment
differs per disease:
amoxicillin-clavulanate for otitis media, sinusitis
vancomycin, ceftriaxone for pneumonia
listeria treatment
ampicillin
corynebacterium diphtheriae treatment
anti-sera w/ penicillin or erythromycin
a. israelii treatment
penicillin
nocardia treatment
TMP-SMX
strep viridans treatment
vancomycin, ceftazidime
enterococus treatment
B lactams
vancomycin + aminoglycoside
bite wounds treatment
amoxicillin-clavulanate
bartonella henselae treatment
macrolides
b. fragilis treatment
empiric: w/ cephalosporin + metronidazole
c. tetani treatment
antitoxin
penicillin, metronidazole
gas gangrene treatment
surgical debridement
high dose penicillin + gentamycin
necrotizing enteritis treatment
fluid and salt supplement, cephalosporins, metronidazole
botulism treatment
botulinum antitoxin, babyBIG for infants
neisseria meningitidis treatment
cephalosporins
neisseria gonorrhoeae treatment
cephalosporin + azithromycin for possible chlamydia
moraxella catarrhalis treatment
amoxicillin-clavulanate
legionella pneumophila treatment
macrolides, levofloxacin
mycoplasma pneumonia treatment
empiric: macrolide