Week 7: Anti-Infectives Flashcards
14 Prototype Anti Infective Drugs
- Penicillin
2.Cephalosporins - Aminoglycosides
- Tetracycline
- erythromycin
- ciprofloxacin (Cipro)
- metronidazole (Flagyl)
- Sulfa Drugs
- Isoniazid (INH)
- Rifampin (Rifadin)
- Amphotericin B (Fungizone)
- Acyclovir (Zovirax)
- zidovudine (Retrovir)
- saquinavir (Fortovase)
Selective Toxicity
a trait of a compound where it focuses on a specific organism or cell without injuring the host cells or body - does not cause unintended damage
Anti infectives interfere with what things?
Cell walls (bacteria have rigid cell walls, mammal cells dont)
Necessary Enzymes
Bacterial protein synthesis
Broad Spectrum v Narrow Spectrum
Broad agents kill off lots of organisms but narrow spectrums kill only one class or subclass of organism
We may end up treating with broad spectrum until we know exacts but broad spectrum opens up the possibility for microbial resistance
Bactericidal
Kills Bacteria
Bacteriostatic
Does not kill bacteria but prevents them from multiplying
Things will come to a halt and then the immune system finishes the job
What is important to do after C&S testing
match the bug to the drug!
Superinfection
“Secondary Infection”
A supra/secondary infection on top of a regular infection you already had
What are some common secondary infections
AAD Diarrhea
Urinary Pain, Infection
Vaginal Infections
Thrush
What is the most common secondary infection
AAD - Antibiotic Associated Diarrhea
How to avoid resistance in bacteria
avoid inappropriate use!!!
use narrow spectrum drugs when possible
send cultures and samples FIRST (before using anti infective agents)
do not discontinue ant infectives prematurely
anti infective use in animals, like livestock
Prophylaxis
Prevention through early drug use
not used as often as it once was
Prophylaxis with anti infectives is mainly for what situations
Surgery (but gets discontinued promptly)
Valvular Heart Disease (Endocarditis)
Immunosuppressed Patients
Penicillin
One of the first major classes of anti infective agents
A class of anti infectives with various preparations
Bacteriocidal
What is the action of penicillin
BACTERIOCIDAL - it interferes with bacterial cell wall synthesis and allows it to take up so much water -> increase osmotic pressure -> bursts
Penicillin is bacteriostatic of bactericidal
Bactericidal
Penicillin mostly affects what type of bacteria
gram positive bacteria
What sort of bacterial cells does penicillin influence
new and newly forming ones not already mature cells
Penicillin drugs usually end in what suffix
-cillin
What is the most common ADR of penicillin
GI Symptoms
What is the major ADR of concern with Penicillin
ANAPHYLACTIC REACTIONS
Includes: Vascular Collapse, Cardiac Arrest, Laryngeal Edema, Bronchospasm
A fairly high incidence of allergic rxns exist
What is penicillin densitization
a treatment designed to help the body overcome penicillin allergies
What is a mechanism bacteria have developed to stop the effect of penicillin
some bacteria produce penicillinase (usually Beta lactamase) which will block the action of penicillin
How have we overcome the defense of penicillinase in resistant bacteria
We mix penicillin with a beta lactamase inhibitor like K Clavulanate (together makes Augmentin) to inhibit that effect and allow penicillin to work