Infections Flashcards
What is used in guiding selection of antibiotic
Kirby-Bauer method
What is used to determine lowest conc. of antibiotic that inhibits visible bacterial growth vs conc. that kills >99.9% bacteria
Dilution test
How do antibiotics that inhibit cell wall synthesis act?
- Inhibits synthesis of peptidoglycan
- bind irreversibly to penicillin binding protein
- leads to cell death
What class of antibiotics don’t need b-lactamase inhibitors
- Monobactams
- Carbapenem
General side effects of b-lactactame antibiotics
Nausea and diarrhoea
Examples of b-lactamase inhibitors
Tazobactam
Clavulanic acid
What class of drugs interfere with bacteria cell wall
‘PCCM’
- penicillin
- cephalosporins
- carbapenems
- monobactams
Side effects of fosfomycin
Nausea
Diarrhoea
Dizziness
Headache
Side effects of cycloserine
Neurological and psychological disturbances
Side effects of vancomycin
- Hypotension
- Flushing (red man syndrome)
- Nephrotoxicity
- Ototoxicity
- Blood disorders
What drugs are used in tuberculosis
Isaniazid
Ethambutol
Side effects of isoniazid
Hepatotoxicity
Peripheral neuropathy
(tingling, constipation, numbness, diarrhoea)
Side effects of ethambutol
Vision loss
What drugs are CI in penicillin allergy
Cephalosporins
Which cephalosporins are excreted by the liver
Ceftriaxone
Cefoperadone
the rest are excreted by the kidney
What drug interferes with the absorption of penicillin and cephalosporins
Probenecid - used in gout and gouty arthritis
Side effects of cephalosporins
- hypersensitivity
- GI distress - C.Diff & Diarrhoea
- Rare haemolytic anaemia
- Severe bleeding
What is used as an alternative to cephalosporin
- gram +: Monobactams
- gram -: Macrolides
What cephalosporins have disulfiram like action
Cefoperazone
Cefotitan
intolerance to alcohol
Examples of first gen cephalosporins
’cefa’
- Cefazolin
- Cefalexin
- Cefradine
Examples of second gen cephalosporins
- Cefaclor
- Cefuroxime
- Cefotetan
Examples of third gen cephalosporins
’ime, one, ten, ir except cefuroxime’
-Ceftriaxone
- Cefotaxime
- Cefixime
Does the third gen cephalosporins cross BBB
Yes
and cefuroxime
What cephalosporin can be used for surgical prophylaxis
Cefazoline
long half life