Pharm Final 1 Flashcards
bacteriostatic drugs might not be effective in a patient that is
immunocompromised
4 categories of antibiotics
Cell Wall
Cell Membrane
Protein
DNA
Cell wall synthesis prototypes
Ampicillin
Amoxicillin
Cephalexin
Ampicillin
Cell Wall antibiotic
Amoxicillin
Cell Wall antibiotic
Cephalexin
Cell Wall antibiotic
Gram positive bacteria
Thick peptido layer
easier to kill
Gram negative bacteria
Thin peptido layer
Outer membrane
Cephalosporins and penicillins are b___ ___ antibiotics
beta lactam antibiotics
Cephalosporins and penicillins work by binding to
PBPs
Cephalosporins and penicillins work by binding to PBPs which inhibits transpeptidation, and therefore changes the cell wall
rigidity
In addition to binding to PBPs, Cephalosporins and penicillins activate
autolytic enzymes in the cell wall
Because of an outer membrane, Cephalosporins and penicillins have a tougher time penetrating
gram negatives
Cephalosporins and penicillins are bacter___
bactericial
Transpeptidation is linking of
AAs by sugar, forming a cell wall
Bacteria resist Cephalosporins and penicillins in 3 ways
Beta lactamase
Lacking a cell wall
being metabolically inactive
We respond to beta lactamase with ____ acid
clavulonic acid
Augmentin
amoxicillin plus clavulonic acid
C dif infection is called
pseudomembranosis colitis
C dif treatment
stop antibiotic
sometimes give vancomycin or metronidazole
Penicillin G route and use
IM or IV
narrow spectrum
Penicillin V route and use
Oral
Strep
In addition to augmetin, B-lactamase resistant drugs are
cloxacillin and methicillin
Spectrum of ampicillin and amoxicillin
broad
Penicillin uses
pneumoniae
pyogenes
gonococcal
strep
Penicillin side effects
- Allergic reaction (rash all the way up to anaphylaxis)
- GI
- Superinfection (i.e. yeast infection and C dif)
Cephalexin
- 1st generation cephalosporin
- treats gram positive cocci
- treats UTI
Because penicillins and cephalosporins have similar structure, you may have similar
allergic reaction
Someone allergic to penicillin can take cephalosporin if
the penicillin allergy is mild
Cephalosporin generations
narrow to broad
peripheral to central
Cephalosporin side effects
Allergy (very common, 6 to 18%)
Bleeding (don’t take with warfarin or heparin)
Superinfection
Polymyxin B
Cell membrane inhibitor
Polymyxin B is selective for
bacterial cell walls, not animal cells
Polymyxin B act like
detergents, disrupting the cell wall
some Polymyxin B inhibiting
synthesis of lipids
Polymyxin B side effect
major nephrotoxicity
Polymyxin B are effective against
gram negative bacteria
The only Polymyxins used clinically are
B and E
Polymyxin B is bacter___
bactericidal
Polymyxin B route
IM or intrathecal
Polymyxin B use is mostly confined to
topical (doesn’t cross the BBB to go central)
Polymyxin B is the drug of choice for
aeruginosa
drug of choice for aeruginosa
Polymyxin B
Protein inhibitor prototypes
Tetracylcine Doxycycline Gentamycin Erythromycin Chloramphenicol
tetracyclines are bacter___
bacteriostatic
Protein inhibitors effect
gram positive and negative (they’re broad because everyone needs protein)
Protein inhibitor mechanism
bind to 50s or 30s on the ribosome to block peptide formation
3 kinds of resistance against protein synthesizers
- alter ribosomal binding sites
- block the drug from entering
- enzymes to deactivate the drug
Protein inhibitors are divided into
tetracyclines
aminoglycosides
macrolides
chloramphenicols
tetracyclines (protein inhibitor) prototype
tetracycline
doxycycline
aminoglycoside (protein inhibitor) prototype
gentamycin
streptomycin
macrolide (protein inhibitor) prototype
erythromycin
tetracyclines are the drug of choice for
mycoplasma pneumoniae chlamydiae rickettsia Lyme disease (doxycycline only) Rocky mountain Q fever Acne
tetracycline side effects
- binds to calcium in newly forming teeth/bones (which can stunt children’s growth and discolor teeth)
- liver
- photosensitivity (wear sunblock)
Tetracycline NI
Eat yogurt to help with GI
Avoid during pregnancy because it crosses the placenta
Gentamycin/strepomycin uses
gram negative
Only for serious conditions like bacturemia, sepsis, endocarditis.
C dif infection is called
pseudomembranosis colitis
Gentamycin/strepomycin are bacter___
bactericial
Gentamycin/strepomycin route
parenteral because they have poor bioavailability
Gentamycin/strepomycin side effects
major problem with resistance
ototoxicity
nephrotoxicity