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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 |