Antimocrobials Flashcards
What are the circumstances that require anti microbial therapy?
- organism based treatment
- syndrome based treatment
- empiric therapy
- prophylaxis
What is the antibiotic ladder that should be followed?
1- Penicillin G
2- oxacillin-nafcillin (MSSA) OR amoxicillin (E coli)
3- ampicillin-sulbactam (clavulanate) -> gram positive & gram negative coverage
4- Vancomycin (MRSA) OR piperacillin-Tazobactam (pseudomonas)
What patients are more susceptible to MRSA infections?
Inpatients with
- foley catheters
- central lines
- dialysis
What are the adverse effects of anti microbial?
- GI upset
- hypersensitivity
- leukopenia
- neurological reactions (altered mental status, seizures)
- interstitial nephritis
- hepatotoxicity (oxacillin)
What are the generations of cephalosporins?
1st Generation -> cefazolin, cephalexin
3rd Generation -> Cefixime, Cefotaxime, Ceftazidime, ceftriaxone
4th Generation -> cefepime
What are the first generation cephalosporins used for?
- Skin infections like cellulitis
- prophylaxis before surgery
What are the characteristics of 3rd generation cephalosporins?
- cover gram positive & gram negative organisms
- cross the blood brain barrier (used for meningitis)
What does the 4th generation of cephalosporins cover?
Pseudomonas
What is the preferred antibiotic for anaerobic infections above the diaphragm?
Clindamycin -> inhibits 50s subunit
What is the preferred antibiotic for anaerobic infections below the diaphragm?
Metronidazole -> creates free radicals
What is the preferred antibiotic for anaerobic infections everywhere?
- B lactams/B lactamase -> inhibit cell wall synthesis
- Carbapenems -> inhibit cell wall synthesis
What are the side effects of penicillins?
- hypersensitivity
- hemolytic anemia
- drug induced interstitial nephritis
What are the side effects of carbapenems?
Seizures (CNS toxicity)
What are the side effects of vancomycin?
- nephrotoxicity
- ototoxocity
- red man syndrome
- DRESS syndrome
What are the side effects of aminoglycosides?
- nephrotoxicity
- neuromuscular blockage (CONTRAINDICATED IN MYASTHENIA)
- ototoxicity