Exam 4 Flashcards
Is peptidolgycan in gram-negative gram-positive or both?
both
What are the four β-lactam drugs? Cidal or static?
penicillin/cephalosporin/monobactams/carbapenems
-cidal
What is the main adverse effect of the penicillins?
hypersensitivity
What is the main β-lactamase inhibitor?
Clavulanic acid
What two drugs are contained in augmentin?
amoxicillin and clavulonic acid
What is the main adverse effect of cephalosporins?
hypersensitivity
Which two antibiotics can have disulfarim effects?
metronidazole and cephalosporins
Is Aztreonam effective against gram positives or gram negatives?
Negative
What is the only monobactam? What is notable about this drug? Susceptible to β-lactamase?
Aztreonam
enters CSF
no
What is the main adverse effect of Aztreonam?
hypersensitivity
Can Carbapenems penetrate the CNS?
yes
Which β-lactam is resistant to β-lactamase?
Carbapenems
What other drug is imipenem administered with? Why?
cilastatin
to prevent renal clearance
Can carbapenems penetrate the CSF?
yes
What is the main adverse effect of carbapenems?
GI issues
What amino acid sequence is vancomycin specific for?
D-ala-D-ala
What are the three toxicities of vancomycin?
oto
nephro
redman
What is the MOA of bacitracin? What two types of applications is bacitracin found? Gram negative, positives of both?
prevent incorporation of amino acids into cell wall
topical and ophthalmic
both
What is the MOA of fosfomycin?
prevent synthesis of UDP-N-acetylmuramic acid
What condition is fosfomycin commonly used to treat?
UTIs
What step of protein synthesis do aminoglycosides inhibit?
initiation complex
What drug class are aminoglycosides often used in combination with? To treat what?
β-lactam
gram-negative infections
What ribosomal subunit to aminoglycosides bind?
30S
What are the two most common toxicities of aminoglycosides?
nephrotoxic
ototoxic
What ribosomal subunit do macrolides bind? What step do they block?
50s
translocation to P-site
What are the three macrolides we have to know for this test?
Erythromycin
Clarithromycin
Azithromycin
What is the main adverse effect of macrolides?
GI issues
What ribosomal subunit do tetracyclines bind? What step do they block?
30S
binding of tRNA to A-site
What are the two main adverse effects of tetracyclines?
sequester calcium
photosensitivity
What is the main use of clindamycin?
soft tissue infections causes by staph or strep
What ribosomal subunit does clindamycin bind?
50S
inhibit translocation to P-site
What are the two MOAs of clindamycin?
prevent binding to A site
prevent peptide elongation
According to Henry, what two serious infections is chloramphenical reserved for?
RMSF and Typhus
Which ribosomal subunit does chloramphenicol bind? Which step of protein synthesis is blocked?
50S
blocks peptidyl elogation
What are the two toxicities of chloramphenicol? Why?
myelosuppression
Gray Baby Syndrome –> lack of glucoronidation
Which ribosomal subunit does Linezolid bind? What is the MOA of linezolid?
50S
prevent formation of bond between ribosome and fMet-tRNA
What antibiotic that interferes with protein synthesis is reserved for severe infections?
Linezolid
What is the toxicity of Linezolid?
myelosuppression
What enzyme do sulfonamides inhibit? What intermediate do they compete with?
Dihydropterate Synthase
PABA
What product do sulfonamides interfere with the synthesis of?
Dihydrofolate
What is the main adverse effect of sulfonamides? What are the three sulfonamide antibiotics?
photosensitivity
Sulfadiazine/sulfamethoxazole/sulfamethizole
What drug functions like trimethoprim? What is the MOA of these drugs?
Pyrimethamine
interfere with bacterial DHFR
What are the two main uses for TMP/SMX?
UTI
prostatitis
Are fluoroquinolones successful against gram negatives, positives or both?
both
What is the MOA of fluoroquinolones?
inhibit topo. II
What are the three main side effects of fluoroquinolones?
GI disturbances
QT prolongation
bind divalent cations
What is the MOA of daptomycin?
depolarizes bacterial cell membrane
Is daptomycin effectvie against gram-positives or gram-negatives?
gram-positives
What organ is effected by Daptomycin?
skeletal muscles
What is the MOA of polymyxin B?
detergent
Is polymyxin B effective against gram positives or gram negatives?
gram negatives
What component of the cell membrane does Polymyxin B bind to particularly well?
LPS
What two drugs are sued to treat an uncomplicated skin infection? What if there is an allergy?
Penicillin or 1st gen. cephalosporin
vanc. or clindamycin
What two drugs are used to treat a skin infection if it is complicated?
penicillin + lactamse inhibitor
What three drugs are used to treat MRSA?
Vancomycin
Linezolid
Daptomycin
What three drugs are used to treat osteomyelitis empirically?
vancomycin
ceftriaxone
cefepime
What is used to treat osteomyelitis in surgeries?
penicillin + lactamse inhibitors
What drug is used to treat septic arthritis empirically?
ceftriaxone
Which antibiotic works well on adherent bacteria especially in a joint?
Rifampin
What drug is used to treat acute sinusitis?
augmentin
What two drugs are used to treat pharyngitis?
penicillin or amoxicillin
What drug is used to treat community acquired pneumonia?
macrolide
What two drugs are used to treat hospital acquired pneumonia?
β-lactam (+) macroldie
What two drugs are used to treat MRSA pneumonia?
vancomycin and linezolid
What drug is used to treat ventilator associated pneumonia?
ceftriaxone
What drug combination is used to treat cystitis?
TMP/SMX
What drug combination is used to treat pyelonephritis? In the kidney?
TMP/SMX
Fluroquinolone
What drug is used to treat complicated UTI and prostatitis?
Fluroquinolone
What two drugs are used to treat intra-abdominal infections?
Ticeracillin and clavulunate
What drug combination is used to treat bacterial meningitis?
ceftriaxone/cefotaxime + vanc.
What drug combination is used to treat neonatal meningitis?
ampicillin + cephalosporin + gentamicin
What drug combination is used to treat sepsis?
cefepime + vancomycin
What drug combination is used to treat endocarditis?
ceftriaxone + vancomycin
What drug combination is used to treat fever and neutropenia?
ciprofloxacin + augmentin
What three drugs are used to treat enterococci?
linezolid
daptomycin
tigecycline
What cells does TB reproduce in? Is TB dormant or active inside a granuloma?
macrophages
dormant
Is INH cidal or static? What enzyme activates INH?
-cidal
Kat G
What cells can INH penetrate?
macrophages
Is INH more effective in MTB or MAC?
MTB
What is the MOA of INH?
inhibits synthesis of mycolic acid
What enzyme activates INH?
KatG
What type of people can develop peripheral neuropathy to INH?
slow acetylators
Other than peripheral neuropathy, atients taking INH can develop what other side effect? What exacerbates this side effect?
hepatitis
alcohol
What is the MOA of rifampin? Via what protein?
inhibits bacterial RNA synthesis
DNA dependent RNA polymerase
Is rifampin cidal or static?
-cidal
Which anti-TB drug is a potent p450 enzyme inducer?
Rifampin
Which anti-TB drug is specifically used in HIV(+) individuals?
Rifabutin
Which anti-TB drug is used almost exclusively in combination with other drugs?
Pyrazinamide
Which drug is particularly effective in the acidic environment of macrophages?
Pyrazinamide
What is the main side effect of Pyrazinamide?
hyperuricemia
What is the MOA of ethambutol?
inhibits arabinosyl transferases
Which anti-TB drug is used to treat MAC?
Ethambutol
Which anti-TB drug can produce red/green color blindness?
Ethambutol
Which aminoglycoside can be used against TB?
Streptomycin
Which has greater activity against MAC, rifampin or rifabutin?
rifabutin
What is the special enzyme possessed by bacteria and protozoa that render them susceptible to metronidazole?
pyruvate:ferredoxin oxireductase
What four drugs are known for their disulfarim like activities?
metronidazole
cephalosporins
griseofulvin
procarbazine
Which three specific bugs are primarily treated by metronidazole?
trich and giardia
trophozytes entamoeba histolytica
Which two drugs are used to treat the cysts of Entamoeba?
iodoquinol or Paromomycin
What type of drug is iodoquinol? Effective against?
halogenated hydroxyquinolone
cysts and trophozites
What is the only location where iodoquinol is effective?
lumen
What is the toxicity of iodomycin? What population?
optic atrophy
kids
What type of drug is paromomycin? Effective against?
aminoglycoside
trophozite and cyst
What bug is responsible for diarrhea or HIV?
cryptosporidium parvum
What drug is used to treat C. parvum?
Nitazoxanide
What is the supposed MOA of Nitazoxanide?
interferes with PFOR
What is the Tx for P. jirovecci?
TMP/SMX
What drug combination is used for T. gondii?
Pyrimethamine/Sulfadiazine
What enzyme do Sulfonamides inhibit? This leads to a decreased production of what compound?
Dihydropterate Synthase
Folate
What two drugs belong to the class of Diaminopyrimidines?
trimethoprim and pyrimethamine
What is the MOA of pyrimethamine and trimethoprim?
inhibit DHFR
What are the two drugs used to treat toxoplasmosis?
Pyrimethamine and Sulfadiazine
What drug combination is used to treat P. jirovecii?
TMP/SMX
What are the two most common side effects of quinine? What stage?
Cinchonism and hypoglycemia
erythrocytic
Which anti-malarial is effective against all species?
Mefloquine
What is primaquine effective against?
liver stages of ovale and vivax
Patients being treated with what anti-malarial have to be first screened for G6PDase status?
Primaquine
What is the only drug effective against falciparum?
Malarone
What is artemisinin used for?
resistant species of falciparum
What are the two side effects of Benzimidazoles?
GI and CNS
When are benzimidazoles contraindicated?
pregnancy
What drug is used to treat Strongyloidiases? What is the MOA of this drug?
Ivermectin
muscle paralysis