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Antibiotics
JJC Vet 119
77
Veterinary Medicine
Undergraduate 1
12/14/2013

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Term
antibiotic
Definition
agent produced by a microorganism or semisynthetically that has the ability to inhibit the growth of or kill microorganisms
Term
antibacterial
Definition
agent that inhibits bacterial growth, impedes replication of bacteria, or kills bacteria
Term
antimicrobial
Definition
agent that kills microorganisms or suppresses their multiplication or growth
Term
bacteria
Definition
single-celled microorganisms that usually have a rigid cell wall and a round, rod, or spiral shape
Term
bactericidal
Definition
agent with capability to kill bacteria
Term
bacteriostatic
Definition
agent that inhibits the growth or reproduction of bacteria
Term
beta-lactamase
Definition
enzymes that reduce the effectiveness of certain antibiotics (B-lactamase I = penicillinase, B-L II = cephalosporinase)
Term
dermatophytosis
Definition
fungal skin infection
Term
detergent
Definition
agent that cleanses
Term
disinfect
Definition
to make free of pathogens or make them inactive
Term
fungicidal
Definition
agent that kills fungi
Term
fungistatic
Definition
agent that inhibits growth of fungi
Term
in vitro
Definition
within an artificial environment
Term
in vivo
Definition
within the living body
Term
iodophor
Definition
iodine compound with a longer activity period that results from combination of iodine and a carrier particle that release iodine over time
Term
microorganism
Definition
an organism that is microscopic
Term
sporicidal
Definition
agent capable of killing spores
Term
classes of bacteria
Definition
- Gram -/+
- acid fast staining bacteria
- aerobic/anaerobic
Term
A drug that works on many different classes of bacteria is called __ __.
Definition
broad spectrum
Term
MIC stands for:
Definition
minimum inhibitory concentration
Term
Define MIC.
Definition
(minimum inhibitory concentration)
lowest amount of drug at which bacterial growth is inhibited
Term
Term for the circular area around an antibiotic sample where bacteria can't grow?
Definition
zone of inhibition
Term
How are zones of inhibition measured?
Definition
In mm. Size does not directly correlate to strength of the drug. Must compare measured mm to a chart, or if done by IDEXX, they will tell you S or R (sensitive or resistant).
Term
4 ways bacteria develop resistance to antibiotics:
Definition
1. put a coating over medicine entering the cell
2. destroy antibiotic
3. change cell wall permeability
4. rapid elimination
Term
Why should you not combine penicillins with bacteriostatic drugs?
Definition
Penicillin is only effective against replicating bacteria, and bacteriostatic drugs would halt replication.
Term
5 antibiotic mechanisms of action
Definition
1. cell wall disruption
2. cell membrane permeability changes (leaky)
3. protein synthesis interference at ribosome
4. impair DNA or RNA production
5. disruption of cell metabolism
Term
What is clavulinate potassium / clavulinic acid?
Definition
A drug that inhibits Beta-lactamase produced by bacteria. Often paired with amoxicillin for synergistic effects (Clavamox).
Term
When using an injectable penicillin drug for the first time, what *must* be written on the label? And when does it expire?
Definition
Write date and concentration (you reconstitute it with sterile saline to the concentration you want).

Expires after 10 days.
Term
Injectable penicillins are measured in __ or __.
Definition
units/mL (large animal)
mg/mL (small animal)
Term
SE of penicillins?
Definition
upset gut flora, V/D
Term
Drugs that hind-gut fermenters CANNOT have:
Definition
-penicillins (Can't get PO, but can get injectable)
-lincosamides (Lincomycin, Clindomycin)
Term
What animals are hind-gut fermenters?
Definition
horses, guinea pigs, rats, rabbits
Term
Why can't hind-gut fermenters get certain antibiotics?
Definition
Certain antibiotics upset the gut flora, causing V/D but hind-gut fermenters cannot vomit. Also, with normal gut flora gone, pathogenic bacteria can multiply and cause enterotoxicity.
Term
How do you prepare and store Clavamox?
Definition
-measure water accurately
-shake well before each use
-refrigerate
Term
How do you prepare Cefazolin? How is it administered?
Definition
-add 9.8mL sterile water to the 1g bottle
-Injectable, usually IV (too fast = vomit)
-1mL/10# generally
Term
What drug is often given for pancreatitis?
Definition
Cefazolin, IV very slow to avoid emesis.
Term
What type of antibiotic is Convenia?
Definition
Convenia is a cephalosporin - cefovecin sodium
Term
How is Convenia prepared and stored?
Definition
-reconstitute with sterile water
-label bottle with the date!!!
-refrigerated, even as powder
-lasts 52 days infridge
Term
How is Convenia administered?
Definition
SQ injection
-dogs: maximum 2 injections
-cats: single injection
Term
Convenia remains in the body at therapeutic levels for __ days.
Definition
14
Term
Name the drugs in triple antibiotic ointment.
Definition
Neomycin, Polymyxin & Bacitracin
Term
Which antibiotics are only used topically because they would be nephrotoxic if used internally?
Definition
polymyxin B and Bacitracin
Term
Which antibiotic is effective against anaerobic bacteria, such as those found under the gingiva?
Definition
clindomycin (Antirobe)
Term
Brand name for clindomycin?
Definition
Antirobe
Term
Which antibiotic is used to treat tick-borne diseases?
Definition
tetracycline
Term
Which drug is both nephrotoxic and ototoxic?
Definition
gentamycin (Gentocin)
Term
Neomycin and gentamycin are what class of antibiotics?
Definition
aminoglycosides
Term
Which *class* of antibiotics cannot ever be used in food animals?
Definition
aminoglycosides
Term
Why can't chloramphenical be used in food animals?
Definition
It causes aplastic anemia in humans.
Term
___ antibiotics are inactivated by purulent material and anaerobic environments.
Definition
aminoglycosides (
Term
Aminoglycosides we talked about in class:
Definition
-amikacin (Amiglyde-V)
-neomycin
-gentamycin
-tobramycin
Term
Early signs of kidney problems? Late signs?
Definition
Early: casts in urine, increased protein in urine
Late: increased BUN/creatinin when 75% kidneys gone
Term
Tetracycline is not effective if taken along with...
Definition
-dairy
-iron supplements
-kao pectate / Pepto Bismol

These all chelate with tetracycline and render it uneffective.
Term
What is Fanconi Syndrome, and what causes it?
Definition
Progressive kidney disease, caused by expired tetracycline.
Term
What is chloramphenicol used for?
Definition
Rickettsia, Chlamydia
Term
Lincosamides we talked about in class:
Definition
-lincomycin (Lincocin)
-clindomycin (Antirobe)
Term
Antibiotics that impair DNA or RNA production should never be used in ___, with one exception (name the drug).
Definition
-pregnant animals
-Baytril is the exception
Term
What would an overdose of Flagyl cause?
Definition
CNS problems
Term
Generic for Baytril?
Definition
enrofloxacin
Term
In what forms does Baytril come?
Definition
-injectable
-beef-flavored tabs for dogs
-purple-coated pills that can be peeled and ground for little critters
Term
Generic for Orbax?
Definition
orbifloxicin
Term
Generic for Zenaquin?
Definition
marbofloxacin
Term
Generic for Dicural?
Definition
difloxicin
Term
What class of antibiotic is Baytril?
Definition
fluoroquinolone
Term
Orbax, Zenaquin, and Dicural are all what class of antibiotic?
Definition
fluroquinolones
Term
Fluroquinolone concerns?
Definition
-stimulates CNS, so don't give to seizure patients
-don't give to rapidly growing animals because they can damage joints
Term
Which antibiotic is used to treat anthrax?
Definition
ciprofloxacin (human label)
Term
Antifungals that impair RNA or DNA?
Definition
nystatin, griseofulvin, ketoconazole, miconazole
Term
Brand names for nystatin?
Definition
Panalog, Animax
Term
Brand name for griseofulvin?
Definition
Fulvicin tablets
Term
Conofite consists of __ and __.
Definition
ketoconazole and miconazole
Term
All antibiotics have the potential to cause __ reactions.
Definition
allergic / anaphylactic
Term
Signs of allergic reaction to antibiotic:
Definition
-swelling
-either depressed or very excitable (not normal)
-hypersalivation
-vomiting
Term
How to treat an allergic drug reaction?
Definition
diphenhydramine (Benedryl) and steroids Iv or IM for swelling
Term
Antibiotic risks:
Definition
-allergic reactions
-kill normal flora
-drug residues and withdrawal time
-antibiotic resistance
Term
What supplement might be given with tetracycline?
Definition
Fortiflora / probiotics, because you can't use yogurt (dairy) to promote healthy gut flora while on tetracycline.
Term
Which class of antibiotics is associated with KCS and urine crystals?
Definition
sulfonamides
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