Penicillins Flashcards

1
Q

Beta lactamase inhibitor binds to what part of the penicillin

A

beta-lactamase ( garage)

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2
Q

what part of the cell does penicillin work

A
  • inhibit bacterial cell wall synthesis

- blocks crosslinking of adjacent peptidoglycan strands

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3
Q

Beta-lactam antibiotics target what

A

penicillin-binding proteins (PBP)

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4
Q

Penicillin-binding proteins include what

A

transpeptidase
transglycolases
D-alanine carboxykinase

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5
Q

name 3 broad mechanisms for resistance for penicillin

A
  1. beta-lactamase production by existing disease
  2. failure of antibody to penetrate to PBP targets
  3. low affinity binding of antibiotic to PBP
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6
Q

what does beta-lactamase do to penicillin

A

eats garage structure of penicllin

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7
Q

name 2 diseases that produce beta lactamase

A

staphylococcus

strep. pneumo

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8
Q

for penicillin resistance why is it hard for antibiotics to penetrate to PBP targets

A

gram negative organisms - porin channel does not allow longer chain penicillin go through pore

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9
Q

absorption of penicillin is dependent on what

A

acid stability

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10
Q

how does food impact absorbtion

A

delays and decreases absorption

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11
Q

what drug gets inactivated by surfactant

A

Daptomycin

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12
Q

how well is penicillin distributed throughout the body

A

well distributed

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13
Q

is penicillin soluble in lipid

A

no

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14
Q

where does penicillin have poor distribution? at these locations what makes distribution better

A

brain, CSF, and prostate,

-inflammation

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15
Q

for most antibiotics, most drug concentration is found where in the body

A

urinary concentration

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16
Q

where is drug distribution generally really hard to get to

A

lung then bones

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17
Q

what is the most important route of elimination for penicillin

A

renal

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18
Q

at what rate do infants excrete penicillin

A

slower rate due to immature transpor system

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19
Q

what penicillin drugs excrete through biliary

A
  • ampicillin
  • nafcillin
  • antipsedominal pencillinse
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20
Q

what does Cockroft-Gault equation used for

A

renal function

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21
Q

Cockroft-Gault equation

A

((140-age) (weight)) / ( ( serumcreatine)(72))
weight = kg
female= times.85

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22
Q

when can hypersensitivity occur with pencillin

A

first exposure or re-exposure

23
Q

who mediates an immediate (anaphylaxis) reaction of penicillin in body

24
Q

who mediates an delayed (rash) reaction of penicillin in body

A

IgM or IgG

25
what is the most common hypersensitivity reaction to pencillin? where does it usually start
maculopapular rash | abdomen
26
by getting a blood test, how does one know if they have a maculopapular rash
eosinophil count goes up
27
eosinophilia
increased eosinophils
28
what are some adverse effects of taking penicillin
- eosinophilia - interstitial nephritis - pseudomembranous colitis
29
what is the difference between administration penicillin G and VK
G: IM VK: oral
30
name two types of penicillin G
procaine pencillin G | Benzatine penicillin
31
Penicillin G has what acid stability, how do you work around it
acid labile | - use Pen VK orally
32
Penicillin G/VK work for what bacteria
gram positive except staph, step. pneumoniae, gonorrhea gaining resistance
33
antistaphylococcal penicillins (penicillinase resistant penicillins) are used to treat what
strap/strep
34
name two aminopenicillins
ampicillin | amoxicillin
35
in aminopenicillins what does the amino group allow
penetration into gram negative cell wall
36
what is the difference between ampicillin and amoxicillin
ampicillin - 4 times a day | amoxicillin - 3 times a day ( better absorption)
37
what do aminopenicillins treat
``` strep enterococcus PEK salmonella shigella haemophilus ```
38
what are adverse effects of using aminopenicillins
hypersensitivity | diarrhea
39
how do you decrease the side effect of diarrhea for aminopenicillins? how does this impact the types of aminopenicillins
take with food | ampicillin absorption > amoxicillin
40
what are two types of carboxypenicillins
carbenicillin | ticarcillin
41
what does carboxypenicillins do to cell wall
increase permeability
42
what bacteria does carboxypenicillin cover
- Strep - fence/pek - space bugs - pseudomonas aeruginosa - enterobacrer spp.
43
when does doc perscribe ticarcillin
can't get pipercillin
44
what type of salt is carbenicillin
indanyl salt
45
where are high concentrations of carbenicillin found
urine
46
how does the body react to carbenicillin
cannot tolerate high dosages necessary to treat infection
47
compare ticarcillin with carbenicillin
more active against pseudomonas
48
What do heart failure patients need to watch out for when taking ticarcillin
need to watch sodium levels, ticarcillin gives daily amount of Na
49
what are 2 major adverse effects for carboxypenicillins
- carboxy group cause platelet dysfunction | - sodium overload
50
name a ureidopenicillin
piperacillin
51
what bacteria does pipercillin cover
``` strep enterococcus Fence Space bugs pseudomonas aeruginosa ```
52
beta-lactamase inhibitor /penicillin combinations add what coverage
staphylococcus | anaerobes
53
what are the Beta-lactamase inhibitors
Clavulanic acid sulbactam tazobactam