antibacterials Flashcards
folic acid synthesis and reduction
DNA methylation,
PABA inhibitors: sulfonamides,
DHF inhibitor: trimethoprim
peptidoglycan synthesis inhibitors
glycopeptides ( vancomycin, bacitracin)
peptidoglycan x-link inhibitors
pencillinase-sensitive, pencillinase-resistant, antipseudomonals, cephalosporin (I-V), Carbapenems, Monobactams
Pencillinase sensitive
pencillin G,V; ampicillin; amoxicillin
penicillinase resistant
oxacillin, nafacillin, dicloxacillin
antipseudomonals
ticarcillin, pipercillin
cephalosporin I
cefazolin
cephalosporin II
cefoxitin
cephalosporin III
ceftriaxone
cephalosporin IV
cefepime
cephalosporin V
ceftaroline
Carbapenems
imipenem, meripenem, ertapenem, doripenem,
monobactam
aztreonam
DNA integrity inhibitor (via free radicals)
metronidazole
mRNA synthesis inhibitor (via RNA polymerase)
rifampin
DNA gyrase inhibitor
FQN, quinolone
FQN
ciprofloxacin, levofloxacin
quinolone
nalidixic acid
50s protein synthesis inhibitors
chloramphenicol, clindamycin, linezolid, macrolides, streptogramins
macrolides
azmycin, cymcin, emycin
streptogramins
quinupristin, dalfopristin
30s subunit inhibitors
aminoglycosides, tetracyclines
aminoglycosides
gentamicin, neomycin, amikacin, tobramycin, streptomycin
PCN G/V mechanism
D-ala-D-ala structural analog. Binds PBP.
blocks PBP xlink of peptidoglycan in cell wall.
activates autolytic enzymes
PCN G/V use
G+ organisms, syphilis and gonorrhea
bacteriocidal
PCN G/V ADR
hypersensitivity rxns, direct Coombs + hemolytic anemia
PCN G/V resistance
pencillinase in bacteria cleaves b-lactam ring
penicillinase-resistant PCN MOA
same as PCN; narrow spectrum
pencillinase resistant b/c bulky R group blocks access of B-lactamases
penicillinase-resistant PCN use
MSSA
penicillinase-resistant PCN ADR
hypersensitivity rxns, interstitial nephritis
penicillinase-sensitive PCN MOA
same as PCN, wider spectrum
pencillinase sensitive. also combine with clavulanic acid to protect against destruction by b-lactamase
penicillinase-sensitive PCN use
extended-spectrum pencillin
H. influenzae, H pylori, E. coli, listeria monocytogenes, Proteus mirabilis, salmonella, shigella, enterococci
“Ampicillin/amoxicillin HHELPSS kill enterococci”
penicillinase-sensitive PCN ADR
pseudomembranous colitis, rash, hypersensitivity rxns
penicillinase-sensitive PCN mechanism of resistance
penicillinase in bacteria cleaves b-lactam ring
antipseudomonal PCN MOA
same as pcn, extended specturm
antipseudomonal PCN ADR
pseudomonas, gram - rods
antipseudomonal PCN codrug
susceptible to penicillinase. need B-lactamase inhibitors
antipseudomonal PCN ADR
hypersensitivity rxns
B-lactamase inhibitors
clavulanic acid, sulbactam, tazobactam
cephalosporin MOA
b-lactam drugs that inhibit cell wall synthesis, but are less susceptible to penicillinase
bactericidal
organisms not covered by 1-4 generation
(“Lame”)
Listeria, Atypicals (chlamydia, mycoplasma), MRSA, and Enterococci
1st generation cephalosporin use
cefazolin, cephalexin
gram + cocci; PEK
Cefazolin surgical use
prophylaxis to prevent S aureus wound infections
2nd generation cephalosporin use
cefaclor, cefoxitin, cefuroxime (“Fake fox fur”)
gram + cocci; HENS PEK
HENS
H influenzae, Enterobacter aerogenes, Neisseria, Serratia
PEK
proteus mirabilis, E coli, Klebsiella pneumoniae
3rd generation cephalosporin use
ceftriaxone, cefotaxime, ceftazidime
serious gram - infections resistant to other B-lactams