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DC Antibiotics
Pharmacology Antimicrobials
Question | Answer |
---|---|
Aminoglycoside Drugs | Amikacin, Apramycin, Neomycin, Gentamicin, Dihydrostreptomycin |
Aminoglycoside Spectrum | Gram negative aerobes |
Aminoglycoside MOA | Bacteriocidal - Blocks protein synthesis at 30S |
Aminoglycoside Regulation | No extralabel use in cattle, No gentamicin in food horses, No neomycin in veal calves |
Aminoglycoside Distribution | Does not cross barrier membranes, Accumulates in renal cortex and inner ear |
Aminoglycoside Metabolism | none |
Aminoglycoside Excretion | unchanged in urine |
Aminoglycoside ADE | Nephrotoxicity, Ototoxicity, Occ. muscular blockade |
Beta Lactams | Penicillins, Aminopenicillins, Cephalosporins, Carbepenems |
Penicillins Spectrum | Everything |
Penicillin Regulations | Illegal in food horses & egg producing turkeys, may be found in violation w/racing dogs or horses |
Penicillin MOA | Bacteriocidal - inhibits transpeptidase during cell wall synthesis |
Penicillins Excretion | Active tubular secretion, slower in neonates |
Penicillins ADE | Anaphylaxis, contact dermatitis, serum sickness, IHA in horses |
Penicillins Distribution | Goes into milk, crosses placenta |
Aminopenicillin Drugs | Amoxicillin, Ampicillin |
Aminopenicillin Spectrum | Everything + spirochetes |
Aminopenicillin MOA | Bacteriocidal - inhibits bacterial wall synthesis via transpeptidase |
Aminopenicillin Distribution | Rapidly to most body fluids except eye, CSF, prostate fluids |
Aminopenicillin Excretion | Unchanged in urine. 10-25% of amoxicillin is excreted as penicilloic acid |
Aminopenicillin ADE | Diarrhea and malabsorption (calves) |
Cephalosporin Group 1 Drugs | 1st Generation, parenteral: Cefazolin, Cephalothin, Cephapirin |
Cephalosporin Group 2 Drugs | 1st Generation, oral: Cefadroxil, Cephalexin |
Cephalosporin Group 3 Drugs | 2nd generation, both: Cefoxitin, Cefuroxime, Cefotetan |
Cephalosporin Group 4 Drugs | 3rd generation, parenteral: Cefotaxime, Ceftiofur, Ceftiaxone, Ceftizoxime, Cefovecin |
Cephalosporin Group 5 Drugs | 3rd generation, oral: Cefixime, Cefpodoxime |
Cephalosporin Group 6 Drugs | 3rd generation, parenteral: Ceftazidime |
Cephalosporin Group 7 Drugs | 4th generation: Cefquinome, Cefepime |
Cephalosporin Group 1 Spectrum | Gram + only |
Cephalosporin Group 2 Spectrum | Gram + only |
Cephalosporin Group 3 Spectrum | Gram +, Gram - anaerobes, Enterobacter |
Cephalosporin Group 4 Spectrum | Everything except Staph aureus |
Cephalosporin Group 5 Spectrum | Everything except Staph aureus or Pseudomonas |
Cephalosporin Group 6 Spectrum | Pseudomonas |
Cephalosporin Group 7 Spectrum | Pseudomonas |
Cephalosporin MOA | Bacteriocidal - inhibition of cell wall synthesis via transpeptidase |
Cephalosporin Distribution | Most fluids (no barriers except 3rd gen), found in bile |
Cephalosporin Metabolism | Liver |
Cephalosporin Excretion | Renal tubular secretion |
Cephalosporin ADE | Distrurbs normal GI flora of rabbites and horses, Crosses placenta, in milk, anemia |
Carbepenems (Penicillin) Drugs | Imipenem, Meropenem, Ertapenem, Faropenem, Doripenem |
Carbepenem Spectrum | Everything |
Carbepenem MOA | Bacteriocidal - inhibits cell wall synthesis |
Carbepenem Distribution | Most body fluids including placenta and milk, not CSF |
Carbepenem Excretion | Both renal and non-renal |
Carbepenem ADE | GI effects, renal dz, CNS toxicity, phlebitis if too rapid IV injection |
Amoxicillin-Clavulanate (Clavamox) Spectrum | Everything except Pseudomonas |
Amoxicillin-Clavulanate MOA | Amoxi: inhibits transpeptidase and cell wall / Clavulanate: binds irreversibly to beta lactamase to inactivate |
Amoxicillin-Clavulanate Excretion | Mostly unchanged in urine |
Amoxicillin-Clavulanate ADE | Disturbs GI flora or rabbits & horses, in milk, GI effects in dogs/cats |
Chloramphenicol Spectrum | Everything |
Chloramphenicol Regulation | Illegal in food animals |
Chloramphenicol MOA | BacterioSTATIC - binds to 30S subunit blocking protein synthesis |
Chloramphenicol Distribution | Diffuses into all body tissues incl. milk, highest in liver and kidneys |
Chloramphenicol Metabolism | Rapidly metabolized in liver by glucuronic acid |
Chloramphenicol Excretion | Most as inactive metabolite in kidneys |
Chloramphenicol ADE | Dyscasias in cats, inhibits P450, anorexia, myelosuppresion, aplastic anemia in humans |
Florfenicol Spectrum | G+ aerobes, G- resp/fastidious pathogens |
Florfenicol Regulation | not labeled for dairy or veal, withdrawal times for catfish and cattle |
Florfenicol MOA | BacterioSTATIC - binds to 30S to inhibit protein synthesis |
Florfenicol Metabolism | Liver, florfenicol amine is longest lived metabolite in liver |
Florfenicol Excretion | some in urine and bile as both unchanged and metabolites |
Florfenicol ADE | high in goat milk, diarrhea in horses, anal problems in pigs, decr. eating in cattle |
Fluroquinolone Drugs | Enrofloxacin, Difloxacin, Orbifloxacin, Marbofloxacin |
Fluroquinolone Spectrum | All gram+ & mycoplasma |
Fluroquinolone Regulations | Illegal in food animals |
Fluroquinolone MOA | Bacteriocidal - inhibits topoisomerase |
Fluroquinolone Distribution | Almost everywhere (except CNS and eye) |
Fluroquinolone Metabolism | Liver, enrofloxacin -> ciprofloxacin |
Fluroquinolone Excretion | Urine except difloxacin through bile |
Fluroquinolone ADE | Retinal degeneration in cats, present in milk, arthropathies in young animals, oral ulcers in horses |
Lincosamide Drugs | Clindamycin, Lincomycin |
Lincosamide Spectrum | All anaerobes |
Lincosamide Regulations | Not labeled for chickens for eggs |
Lincosamide MOA | BacterioSTATIC - inhibit protein synthesis via 50S unit |
Lincosamide Distribution | Highly lipid soluble so may be higher in tissues |
Lincosamide Metabolism | Liver except clindamycin (urine) |
Lincosamide Excretion | Mostly in urine and bile. Small amounts in pancreatic and prostate fluids |
Lincosamide ADE | Found in milk, Enterocolitis in pocket pets/horses, GI effects in dogs/cats |
Macrolide Drugs | Tulathromycin, Erythromycin, Tilmicosin, Tylosin |
Macrolide Spectrum | Everything incl. Spirochetes (except Pseudomonas, Enterobacter) |
Macrolide MOA | BacterioSTATIC - inhibit protein synthesis via 50S subunit |
Macrolide Distribution | Highly lipid soluble so may be higher in tissues, crosses placenta |
Macrolide Metabolism | Liver |
Macrolide ADE | GI effects in dogs/cats, found in milk |
Metronidazole (Nitroimidazole) Spectrum | All anaerobes and antiprozoals |
Metronidazole Regulations | Illegal in food animals |
Metronidazole MOA | Inhibits nucleic acid synthesis |
Metronidazole Distribution | Horses: peak in peritoneal, synovial, CSF |
Metronidazole Metabolism | Liver |
Metronidazole ADE | CNS signs in cats/dogs/horses |
Potentiated Sulfonamide Drugs | Trimethoprim, Ormethoprim, Primethamine, Ormetoprim |
Potentiated Sulfonamide Spectrum | Everything except Pseudomonas |
Potentiated Sulfonamide MOA | BacterioSTATIC - deprive cells of essential nucleic acids and proteins |
Potentiated Sulfonamide Metabolism | Liver mostly, but some other tissues |
Potentiated Sulfonamide Excretion | Urine - Glomerular filtration of parent drug and tubular excretion of metabolites |
Potentiated Sulfonamide ADE | Blood dyscrasia, myelosuppression, Crystallization in urinary tract, teratogen, thyroid hyperplasia in pigs |
Sulfonamide Drugs | Sulfadimethoxine, Sulfamethazine, sulfamerazine, slfathiazole, sulfanilamide, sulfachlorapyridazine |
Sulfonamide Spectrum | All aerobes except Pseudomonas |
Sulfonamide Regulations | No extra label use in dairy cattle |
Sulfonamide MOA | BacterioSTATIC - interferes with folic acid synthesis, compete with PABA |
Sulfonamide Distribution | Crosses placenta and BBB |
Sulfonamide Metabolism | Liver, some in tissues or liver |
Sulfonamide Excretion | Urine |
Sulfonamide ADE | Teratogen, Crystallization in Urinary tract, homrrhagic syndrome in chickens/dogs, cutaneous drug eruption in dogs |
Tetracycline Drugs | Oxytetracycline, Chlortetracycline, Tetracycline |
Tetracycline Spectrum | Everything (incl. spirochetes and tetracyclines) except Pseudomonas |
Tetracycline MOA | BacterioSTATIC - inhibits protein synthesis via 50S subunit |
Tetracycline Distribution | Lipid soluble so high in tissues, Doxy is most soluble |
Tetracycline Metabolism | Not biotransformed much before elimination |
Tetracycline Excretion | Most by renal, Doxy goes into intestines where it's inactive |
Tetracycline ADE | Young will have slower renal excretion, Nephrotoxicity, CV dysfunction, tooth discoloration |
Dihydropyrimidine/Trimethoprim MOA | Inhibit folic acid synthesis |
Glycopeptide Drugs | Vancomycin |
Glycopeptide Spectrum | Gram+ only |
Glycopeptide Regulations | Should not be used in multiresistant infections or extra label in food animals |
Glycopeptide MOA | Bacteriocidal - Inhibits cell wall synthesis and bacterial cell membrane permeability |
Glycopeptide Distribution | Widely distributed into all fluids except CSF |
Glycopeptide Excretion | Primarily renal, some in bile |
Glycopeptide ADE | Nephrotoxicity and ototoxicity |
Function of Clavulanic acid | Bind Beta lactamase to improve drug activity against some organisms |
Illegal Drugs in Food Animals | Chloramphenicols, Clenbuterol, DES, Dimetridazole, Ipronidazole, Metronidazole, Furazolidone, Nitrofurazone, Sulfonamides in lactating cows, Flurquinolones, Glycopeptides, Phenylbutazone in dairy cattle |
Susceptibility and Resistance | concentration of drug required to inhibit growth of an isolate as it relates to the likihood of clinical success |
Susceptibility testing methods | Disk diffusion, micro/macrobroth dilution, E test |
Rifampin spectrum | Rodococcus equi (not specifically approved for animals) |
Spectinomycin spectrum | All aerobes and mycoplasma |
Spectinomycin MOA | BacterioSTATIC - 30S subunit without toxic effects of aminoglycosides |
Drugs that treat mycoplasma | Tetracyclines, Macrolides, Fluroquinolones |
Drugs that affect DNA/RNA synthesis | Sulfonamides, Diaminopyrimidines, Fluroquinolones |
Drugs affecting protein synthesis | Macrolides, Lincosamides, Tetracyclines, Fenicols, Aminoglycosides |
Drugs affecting cell wall integrity | Beta lactams: Penicillins, Cephalosporins, Vancomycin |