Antimicrobial Review Flashcards
Penicillin
MOA
Inhibits cell wall synthesis
Penicillin
Mechanisms of Resistance
- B-lactamase production
- Altered PBP
- Decreased drug permability
Penicillin
Gram Pos Coverage
List specific bacteria
Streptococcus spp
Listeria spp
Clostridium spp
Penicillin
Gram Neg Coverage
List specific bacteria
Neisseria spp
Pasteurella
Penicillin
Overall Coverage
Gram Positives
Gram Negatives (more limited)
Spirochete (Treponema pallidum)
Penicillin
Side Effects
- IgE-mediated anaphylaxis
- Integumentary (Maculopapular rash)
- GI upset- Nausea, vomiting, diarrhea
Antistaphylococcal Penicillins
List the Meds
Nafcillin
Oxacillin
Dicloxacillin
Antistaphylococcal Penicillins
Gram Positive Bacterial Coverage
list specific species
Gram Positives
* streptococcus spp
* Clostridium spp
* Methicillin-susceptible Staphylococcus Aureus
Antistaphylococcal Penicillins
Side Effects
Hematologic/Oncologic: agranulocytosis
GI: cholestasis, n/v/d
Aminopenicillins
Overall Coverage
Gram Positives
Gram Negatives
Improved gram neg coverage compared to penicillins
Aminopenicillins
Amoxicillin
Aminopenicillins
Gram Positive Coverage
Streptococcus spp
Enterococcus spp
Aminopenicillins
Gram Neg Coverage
E. Coli
Proteus mirabilis
H. Influenzae
Salmonella spp
Shigella spp
Neisseria meningitidis
Aminopenicillins
Side Effects
GI: n/d
Renal: nephrotoxicity
What can aminopenicillins be combined with?
beta-lactamase inhibitors
Which is better absorbed, amoxicillin or ampicillin?
Oral amoxicillin
Piperacillin/Tazobactam
Side Effects
Hypersensitivity (anaphylaxis)
Integumentary: Stevens-Johnson Syndrome, Toxic epidermal necrosis
Renal: nephrotoxicity
GI: n/v/d
Piperacillin/Tazobactam
Overall Bacterial Coverage
BROAD SPECTRUM (positives, negatives, anaerobes)
How are piperacillin/tazobactams administered?
Infusion (over 4 hrs)
Cephalosporins
MOA
binds to penicillin binding proteins to prevent cell wall synthesis
Cephalosporins
Time or concentration dependent?
Bactericidial or bacteriostatic?
Time dependent
Bactericidal
Penicillins
Time or concentration dependent?
Bactericidial or bacteriostatic?
Time dependent
Bactericidal
Cephalosporins
Class
Beta-Lactams
Cephalosporin
Coverage
1st Gen: great w/ gram positives, poor gram neg coverage
3rd Gen: equalish gram neg/pos coverage
5th Gen: great gram neg coverage, poor gram pos coverage
Cephalosporins
1st Gen Meds & Admin Route
List med names & PO/IV/IM
Cefazolin (IV)
Cephalexin (PO)
Cefadroxil (PO)
Cephalosporins
1st Gen Coverage
MSSA
Beta-hemolytic Streptococcus
PEcK
Define
PEcK
Proteus
E. coli
Klebsiella
Cephalosporins
2nd Gen Meds & Admin Route
List med names & PO/IV/IM
Cefaclor (PO)
Cefprozil (PO)
Cefuroxime (IV/IM/PO)
Cefoxitin (IV/IM)
Cefotetan (IV/IM)
Cephalosporins
2nd Gen Coverage
MSSA
Beta-hemolytic Streptococcus
HEN PEcKS
Oral Anaerobes
Define
HEN PEcKS
H. Influenzae
Enterobacter aerogenes
Neisseria
Proteus
E. coli
Klebsiella
Serratia marcescens
Cephalosporins
3rd Gen Meds & Admin Route
List med names & PO/IV/IM
Cefotaxime (IV/IM)
Ceftazidime (IV/IM/Neb/Intravitreal)
Ceftriaxone (IV/IM)
Cefixime (PO)
Cefpodoxime (PO)
Cefdinir (PO)
Cephalosporins
3rd Gen Coverage
MSSA & Streptococcus
Neisseria meningitidis & gonnorhea
Oral anaerobes
Pseudomonas
Moraxella
H. Influenzae
Cephalosporins
Pearls
- Cross BBB, so can be utilized for meningitis
- Ceftazidime has pseudomona coverage
Cephalosporins
3rd Gen Contraindications
- Infants < 28 days when also using calcium containing products
- Neonates w/ hyperbilirubinemia
Cephalosporins
4th Gen Meds & Admin Route
Cefepime (IV/IM)
Cephalosporins
4th Gen Coverage
MSSA & Streptococcus
Neisseria meningitidis & gonnorhea
Oral anaerobes
Pseudomonas
Cephalosporins
Which generations can be used to treat meningitis because they cross the BBB?
- 3rd Gens
- 4th Gen
Cephalosporins
4th Gen Contraindications
- use with caution in patients w/ seizures (neurotoxicity)
Cephalosporins
5th Gen Meds & Admin Routes
Ceftaroline (IV)
Ceftolozone/Tazobactam (IV)
Cephalosporins
Ceftaroline Coverage
MSSA, MRSA, & Streptococcus
Neisseria meningitidis & gonnorhea
Pseudomonas
Moraxella
H. Influenzae
Cephalosporins
Ceftolozone/Tazobactam Coverage
pseudomonas
No MRSA coverage
Cephalosporins
Side Effects
n/v, loss of appetite, abd pain, nephrotoxicity, hemolytic anemia, super infection (C. diff)
Do cephalosporins have cross reactivity with pencillin allergy?
Yes- greatest in Gen 1 and decreases throughout rest of gens.
3rd Gen and beyond show minimal cross reactivity, but we still avoid in allergy
Do cephalosporins cover Enterococcus spp?
NO
Which cephalosporin does not require renal dose adjustment?
Ceftriaxone
Carbapenem Meds
Doripenem
ertapenem
Imipenem
Meropenem
Carbapenems
MOA
inhibit cell wall synthesis by binding to PBPs, thus, causing bacterial cell wall defect
Carbapenems
Time or concentration dependent?
Bactericidial or bacteriostatic?
Concentration Dependent
Bactericidal
Carbapenem
Bacterial Coverage
Gram neg cocci and bacilli
MSSA and Streptococcus
Anaerobes
Carbapenems
Side Effects
n/v, abd pain, seizures, nephrotoxicity, injection site rxn
Carbapenems
Does ertapenem cover pseudomonas?
NO
Monobactam Med
Aztreonam
Monobactam
MOA
inhibits synthesis of bacterial cell wall by blocking peptidoglycan crosslinking
Monobactams
Time or concentration dependent?
Bactericidial or bacteriostatic?
Time Dependent
Bactericidal
Monobactam
Coverage
Citrobacter spp
Enterobacter spp
E. coli
Haemophilus spp
Klebsiella spp
Proteus spp
Serratia spp
Monobactams
Side Effects
n/v/d, pain at injection site, increase in serum transaminases, neutropenia
Macrolide Meds
Azithromycin
Clarithromycin
Erythromycin
Fidaxomicin
Macrolides
MOA
EXCLUDES FIDAXOMICIN
inhibits RNA-dependent protein synthesis by binds to the 50S ribosomal subunit
Macrolides
MOA
Fidaxomicin
Inhibits RNA polymerase by binding to the DNA template RNA polymerase complex
Macrolides
Time or concentration dependent?
Bactericidial or bacteriostatic?
Time Dependent
Bacteriostatic
At high concentrations can be bactericidal
Macrolides
Side Effects
GI: n/v/d, abd pain
Hepatic: cholestatic jaundice
Cardiac: QT prolongation
Macrolides
What is the only bacteria Fidaxomicin is used for?
PPP
C. diff
Macrolides
Which macrolide has the largest risk of GI disturbance?
PPP
Erythromycin
Macrolides
Overall Bacterial Coverage
Excludes fidaxomicin
Gram Positives
Atypical Bacteria
Spirochete
Limited Gram Negatives
Macrolides
Gram Positive Coverage
Excludes Fidaxomicin
Group A Streptococci
Corynebacterium diphtheriae
Cutibacterium acnes
Macrolides
Atypical Bacterial Coverage
Excludes Fidaxomicin
Mycoplasma pneumoniae
Chlamydia trachomatis
Chlamydophila pneumoniae
Legionella spp
Macrolides
Spirochete Coverage
Excludes Fidaxomicin
Treponema pallidum
Borrelia burgdorferi
Macrolides
Gram Negative Coverage
Excludes Fidaxomicin
Campy
Lincosamide
MOA
inhibits protein synthesis by binding to the 50S ribosomal subunit
Lincosamide Med
Clindamycin
Lincosamide
Time or concentration dependent?
Bactericidial or bacteriostatic?
Time Dependent
Bacteriostatic
at high concentrations it can be bactericidal
Lincosamides
Side Effects
GI: n/v/d, C. diff infection
Integum: Stevens-Johnson Syndrome
Cardiac: QT prolongation
Lincosamides
Overall Coverage
Gram Positives
Anaerobes
Can Clindamycin be used for community acquired MRSA?
Yes
Tetracycline Meds
Doxycycline
Minocycline
Tetracycline
Tetracyclines
MOA
Binds to the 30S ribosomal unit, inhibiting protein synthesis
Tetracyclines
Time or concentration dependent?
Bactericidial or bacteriostatic?
Combination of concentration and time dependent
Bacteriostatic
Tetracyclines
Risk of what injury if patient doesn’t take with water & remain upright?
PPP
Esophageal injury
Tetracyclines
Contraindications
PPP
Avoid in children < 8 and pregnant women due to concern of dental discoloration & bone development delay
Tetracyclines
Overall Coverage
Broad Spectrum AF
Tetracyclines
Gram Positive Coverage
MRSA
Streptococcus (watch for increasing resistance)
Bacillus anthracis
Tetracyclines
Gram Negative Coverage
Rickettsiae
H. Influenzae
Helicobacter pylori
Vibrio cholerae
Tetracyclines
Anaerobe/Spirochete/Atypical Bacteria Coverage
Anaerobe: bacteriodes fragilis
Spirochetes: treponema pallidum, berelia burgodrferi
Atypicals: mycoplasma pneumoniae, chlamydia trachomatis, chlamydophila pneumoniae, Legionella spp
Tetracyclines
Side Effects
- Teeth & Bone Effects
- Integum: photosensitivity
- GI: n/d/v, C. diff infection
Aminoglycosides
MOA
interferes with bacterial protein synthesis by irreversibly binding to the 30S ribosomal subunit
Aminoglycoside Meds
Gentamicin
Tobramycin
Amikacin
Aminoglycosides
Time or concentration dependent?
Bactericidial or bacteriostatic?
Concentration Dependent
Bactericidal
Aminoglycosides
Gram Negative Coverage
PEcK
Pseudomonas
Enterobacter
Shigella
Aminoglycosides
Side Effects
Renal Toxicity
Vestibular/Auditory Toxicity
Neuromuscular Blockades
Are aminoglycosides uses as a mono treatment?
PPP
NO- paired with broad spectrum beta-lactams
Sulfonamide Meds
Sulfamethoxazole
Trimethoprim
Sulfonamides
Time or concentration dependent?
Bactericidial or bacteriostatic?
Time Dependent
Bacteriostatic
Sulfonamides
Sulfamethoxazole MOA
Inhibits bacterial folic acid synthesis via competing with para-aminobenzoic acid inhibiting formation of dihydrofolic acid formation
Sulfonamides
Bacteria Coverage
Broad Spectrum
Gram Positives (including MRSA)
Gram Negatives
Protozoa (cyclo)
Fungi
Sulfonamides
Trimethoprim MOA
competitively inhibits folic acid production by inhibiting dihydrofolic acid reduction to tetrahydrofolate, leading to inhibition of the enzymes in folic acid production
Sulfonamides
Side Effects
GI: n/v/d
Heme: thrombocytopenia, hemolytic anemia, severe hyperkalemia
Integum: photosensitivity
Sulfonamides
Contraindications
PPP
- hypersensitivity to sulfa
- hx of drug induced thrombocytopenia
- infants < 2 mo
- pregnancy
Fluoroquinolones
MOA
Inhibiting the activity of DNA gyrase and topoisomerase which are enzymes essential for bacterial DNA replication
Fluoroquinolones Meds
Ciprofloxacin
Levofloxcain
Moxifloxacin
Ofloxacin
Gemifloxacin
Delafloxacin
Fluoroquinolones
Time or concentration dependent?
Bactericidial or bacteriostatic?
Concentration Dependent
Bactericidal
Fluoroquinolones
Gram Pos Coverage
Staphylococcus spp
Streptococcus spp (minus cipro)
Enterococcus faecalis
Listeria monocytogenes
Fluoroquinolones
Gram Neg Coverage
PEcK
H. influenzae
pseudomonas (only cipro)
Fluoroquinolones
Which meds have coverage against addition atypical bacteria?
2
levo
moxi
Fluoroquinolones
Side Effects
GI: n/v
Cardio: QT prolongation
Neuro: CNS adverse effects (insomnia, hallucinations, seizures)
Integum: photosensitivity
Musculo: TENDON RUPTURE
Nitroimidazole Meds
Metronidazole
Nitroimidazoles
MOA
diffuses into the organism and inhibits protein synthesis by interacting with DNA which leads to the loss of DNA helical structure and strand breakage
Nitroimidazoles
Time or concentration dependent?
Bactericidial or bacteriostatic?
Concentration Dependent
Bactericidal
Nitroimidazoles
Bacterial Coverage
Anaerobic bacteria
Protozoan parasites