Antimicrobials Flashcards
Fight infections
Antimicrobials
Kill organism
Biocidal
Neutralize/stunt growth and activity
Biostatic
These work solely on bacteria
Antibiotics
Range of bacteria the antibiotic is effective against
Spectrum of Action
Gram + stains
purple
Gram - stains
red/pink
3 shapes of bacteria
- coccus
- bacillus
- spirochete
Work on -‘s OR +’s
Narrow spectrum
Work on BOTH + and -
Broad spectrum
Works on bacteria that need O2
Aerobic
Works on bacteria that don’t need O2
Anaerobic
This type of test tells if the bacteria is resistant, intermediate, or susceptible
Agar Diffusion/Kirby Bauer
This type of test determines the lowest amount of the antibiotic given will deactivate or kill the bacteria
Minimal Inhibitory Concentration (MIC)
Antibiotics should be taken
every day at the same time until it is gone
Can cause food allergies or antibiotic resistance
Should use caution with withdrawl times in food producing animals
Antibiotic residue
6 classes of antibiotics
- Cell wall agents
- Cell membrane agents (polypeptides)
- Protein synthesis agents
- Antimetabolites
- Nucleic Acid Agents
- Miscellaneous
Penicillins, cephalosporins, polypeptides, and glycopeptides are all classified as
Cell Wall Agents
This was discovered by Sir Alexander Fleming
Has a beta-lactam structure
Fairly newer drug
Penicillin
4 types of penicillin
- Natural
- Broad spectrum
- Beta-lacatamase resistant
- Potentiated
These type of penicillins are used most commonly in veterinary medicine
Derived from penicillin mold
Treats Gram + only
Ex: Penicillin G and Penicillin V
Natural Penicillins
Most common natural penicillin used
Procaine Pen G
The duration of Procaine Pen G
24 hrs
The duration of Benzathine pen G
5 days
Penicillins that Treat Gram + and Gram -
Most widely used
Ex: amoxicillin, ampicillin, carbenicillin, ticaricillin, piperacillin
Broad spectrum
Most common broad spectrum penicillin that comes in a tablet or liquid
amoxicillin
Enzyme made by bacteria that destroy the beta-lactame ring
Beta-lactamase
Beta-lactamase is AKA
Penicllinase
The working component of an antibiotic
Beta lactame ring
Resistant to beta-lactamase
Ex: oxacillin, dicloxacillin, cloxacillin, floxacillin
Beta-Lactamase Resistant Penicillin
Another drug is added to enhance a penicllin’s effect (acts as a bodyguard)
Ex: Amoxicillin/clavulanic acid (Clavamox)
Potentiated Penicillins
These type of drugs are similar in structure and pharmacologically similar to penicillins
Have a beta-lactam ring
Developed in the 1960’s
4 generations of drugs
Cephalosporins
If a pt is allergic to __________ they will usually be allergic to cephalosporins
penicllins
Two most widely used generations of Cephalosporins
1st and 3rd
These Cephalosporins have the greatest bacteriocide and bacteriostatic activity but they are inactivated by beta-lactamase
Ex: cefazolin and cephalexin
First generation
These cephalosporins have a broad spectrum against G -, less G +
Ex: cefotoxin
Second generation
These cephalosporins have a broader spectrum of G - bacteria and are resistant to beta-lactamase
Ex: ceftiofur, cefovecin. and cefpodoxine
Third generation
These cephalosporins are similar to third generation
Ex: cefepime
Fourth generation
An injection of this cephalosporin lasts for 14 days
Cefovecin (Covenia)
These antimicrobials have no beta-lactam ring, are toxic to the kidneys when injected, and are usually administered via topical medication
Made of long chains of amino acids
Ex: polymyxcin B, bactracin
Polypeptides
Potentiated with neomycin to create neosporin
polypeptides
These antimicrobials treat infections that are resistant to penicillin and cephalosporins
Treat drug resistant staph
Rarely used in nonhumans because it is ototoxic
Ex: vancomycin
Glycopeptides
If a drug is ototoxic, it usually effects the
organ of corti hairs
These antimicrobials inhibit protein synthesis and stays within the GI tract when given orally
Can be nephrotoxic and ototoxic
Not for food producing animals
Used in any type of infection
Ex: gentamicin, amikacin, streptomycin, tobramycin, neomycin (Topical, Neosporin)
Aminoglycosides
These antimicrobials bind to Ca, so they should not be given to young animals because they can stunt growth
Used to treat tick borne agents (Rickettsial agents)
Ex: Doxycycline, tetracycline, oxytetracycline, minocycline
Tetracyclines
This type of antimicrobials are bacteriostatic and work by penetrating tissues and fluids
Banned in food producing animals
Can cause bone marrow suppression
WEAR GLOVES AND MASK WHEN DISPENSING
Chloramphenicol
Used in large animals only and administered in the neck region of bovines
Used to treat bovine respiratory infections
Florfenicol (Nuflor)
These type of antimicrobials are used to treat soft tissue infx or resp. infx
It’s a good substitute for penicillin allergies
Ex: Erythromycin, tylosin, azythromycin
Macrolides
This type of macrolide is dose dependent and treats penicillin-resistant infx
Erythromycin
This macrolide is used to treat D+ in chicken and fowl
It is given in water
Tylosin
This macrolide is derived from erythromycin and is used to treat UTI’s and Feline herpes
Azythromycin (Zithromax)
Lincomycin and clindamycins are considered
lincosamides
This lincosamide is used to treat dental infx in cats
Clindamycin
These antimicrobials are formulated from sulfur
Can cause allergic rxns because of conjugation issues
Antimetabolites
Sulfonamides are considered
Antimetabolites
These are synthetic antimicrobials that are bacteriocidal when potentiated
Used to treat UTI, parasites, topical wounds, and abscesses
Can cause crystaluria, KCS, and skin rashes
Ex: sulfadimethoxine, sulfadiazine/trimethorprin, sulfadimethoxine/ormetroprim
Sulfonamides
Used as a dewormer
sulfadimethoxine
These antibiotics inhibit DNA function of bacteria without harming the host
Can be used in pocket pets
Ex: enrofloxacin, orbifloxacin, difloxacin, marbofloxacin, sarafloxacin, ciprofloxacin
Fluoroquinolones
Enrofloxacin is AKA
Baytril
The antibiotic of choice for pocket pets
Baytril (enrofloxacin)
Used in large animals and can be carcinogenic
Prohibited in food producing animals
Ex: furazolidone, nitrofurazone, nitrofurantion
Nitrofurans
Used as an antibiotic for aquatics, no longer available in the US
furazolidone
Nitrofuran used in large animals for joint inflammation
Comes in a bright yellow cream
Nitrofurazone
Used as an antidiarrheal, antibacterial, and antiprotozoal
Mostly used for K9 diarrhea
Ex: metronidazole (Flagyl)
Nitroimidazoles
Specific drug used to treat K9 diarrhea
Flagyl (metronidazole)
These type of antibiotics are used with erythromycin to disrupt RNA
Treats Rhodococcus equi in foals
Causes body fluids to turn orange
Ex: rifampin
Rifamycins
2 groups of fungus
Yeast and mold
Fungi are resistant to
antibiotics
Type of antifungals that bind to fungal cell membrane and rips it apart
Ex: Nystatin and amphotericin B
Polyenes
Most widely used antifungals
Ex: ketoconazole, miconazole, itraconazole, fluconazole
Imidazoles
Weak antifungals
Ex: flucytosine
Antimetabolic Antifungals
These antifungals are used for ringworm, athlete’s foot, and infx of the scalp and nails
Should be given with food
Possibly teratogenic
Ex: griseofulvin
Superficial Antifungals
These prevent replication of viruses
Limited veterinary uses
Antivirals
Used to treat herpes
Acylovir
Used to treat herpes and FELV
interferon
Removal/destruction of microbes
Sterilization
Free of pathogens
Asepsis
Removal of bacteria from inanimate objects
Disinfection
Removal of bacteria from animate/living organisms
Antiseptic
Physically removing organic materials
Sanitatizing
Amount of time you allow a disinfectant/antiseptic to stay on a surface
Contact time
What is a broad spectrum drug?
Fights G + AND - bacteria
What is a narrow spectrum drug?
Fights G + OR - bacteria
When bacteria change in some way to reduce or eliminate the effectiveness of the agent used to treat or prevent infection
Resistance
Left over drug within tissues
Residue
Beta-lactamase is AKA
Penicillinase
A penicillin that is beta-lactamase resistant
oxacillin
The administration difference between Pen G and Pen V
Pen G- injectable
Pen V- oral
The molecular structure found in penicillin that allows for the interference with bacteria cell wall synthesis
Beta-Lactam ring
The difference between antiseptic and disinfectant
Antiseptic - Animate objects
Disinfectant - Inanimate objects
A drug considered an antidiarrheal/antibiotic/antiprotozoal
Metronidazol (Flagyl)
Cefazolin is found in which generation of cephalosporins
1st
Simplecef is found in which generation of cephalosporins
3rd
Primary side effect of sulfonamides
Crystal uria
To prevent crystal uria with the use of sulfonamides, it is recommended that the pet should
Drink more H2O
Why would a dog be placed on a tetracycline?
To treat Rickettsial agents
Why should tetracyclines be avoided in young animals and pregnant animals?
It binds to Ca, can stunt growth and turn teeth yellow
A 14y/o cat was admitted to the hospital for a routine dental with possible extractions. Upon oral examination, the vet decided to extract two molars. What lincosamide would be prescribed?
Clindamycin
Griseofulvin is used to treat
Ringworm/dermatophytes
A 4y/o mastiff was prescribed an antibiotic for the treatment of meningitis. The owner called stating the dog was experiencing V/D. The owner described the dog’s urine as red-orange color. What antibiotic may he be on?
Rimfomycin
What does it mean when a drug is potentiated?
It is combined with another drug to enhance effects
A potentiated antibiotic
Clavamox
An ototoxic aminoglycoside
Gentamicin
What fluoroquinolone is safe to give to pocket pets?
Enrofloxacin
Enrofloxacin is AKA
Baytril
What is the concerning effect of taking chloramphenicol?
Bone marrow suppression
Used to treat bovine respiratory dz
Flurophenicol
The concerning side effect of amphotericin-B
Nephrotoxicity
The glycopeptide used to treat drug-resistant Staph
vancomycin
Kills germs
Germicide
Kills bacteria
Bacteriacidal
Antiviral used to treat FeLV in cats
interferon
The antiviral that is specific for herpes virus infections and used to treat ocular feline herpes virus
aclovir
What is critical to the efficacy of the disinfectant or antiseptic agent?
Contact time
Chlorine is a
disinfectant
Chlorhexadine is a
disinfectant and antiseptic
Hydrogen peroxide is a
disinfectant and antiseptic
Lysol is a
disinfectant
Ethylene oxide is a
disinfectant
Is ketokonazole an antibiotic or antifungal
antifungal
Fungal infections are known as
mycoses