Antibiotics Flashcards
Antibacterial Agents
antibiotics (natural substances produced by certain groups of microorganisms), chemotherapeutic agents (chemically synthesized), semisynthetic antibiotics (part of molecule modified by chemist), synthetic antibiotics (some antimicrobial compounds, originally discovered as products of micro-organisms, synthesized entirely by chemical means) read mechanism of action
Ideal antibiotic
wide spectrum, nontoxic and no side effects, nonallergenic, doesn’t eliminate normal flora, should be able to reach point of infection, inexpensive, easy to produce, chemically stable, uncommon microbial resistance, read about penicillin
Betalactamines - Monobactams
Aztreonam
Betalactamines - Dibactams - Penicillins - Narrow Spectrum - B-lactamase sensitive
benzylpenicillin (penicillin G), phenozymethylpenicillin (penicillin V), procaine penicillin, benzathine penicillin
Betalactamines - Dibactams - Penicillins - Narrow spectrum - B-lactamase resistent
Methicillin, oxacillin, nafcillinm, cloxacillin, dicloxacillin, flucloxacillin
B lactamins - Penicillins - Moderate spectrum
Amoxicillin, ampicillin
B lactamines - Broad spectrum
Amoxiclav
B lactamines - Penicillins - extended spectrum
ticarcillin, mezlocillin, carbenicillin, piperacillin, azlocillin
Carbapeam & Penam (broadest spectrum B-lactam)
imipenem, faropenem, meropenem, doripenem,ertapenem
Cephalosporins (Cephams) First gen
moderate spectrum: cephalexin, cephalothin, cefazolin
Cephalosporin second gen
moderate specter with anti-Hemophilus activity: ceflacor, cefuroxime, cefamandole (moderate spectrum with anti-anaerobic): cefotetan, cefoxitin
Cephalosproin third gen
broad spectrum: ceftriaxone, cefotazime, cefpodoxime (broud spectrum with anti-pseudomonas), ceftazidime
Cephalosporin fourth gen
broad spectrum w enhanced activity against Gram positive and b lactase stability : cefepime, cefpirome
Cephalosporin fifth generation
broad spectrum with Gram neg and pos, including MRSA: ceftaroline
Tribactam
sanphetrinem
B lactase inhibitors
clavulanic acid, tazobactam, sulbactam
Read about
beta lactimases
Benzylpenicillin (Penicillin G)
dibactam, Spectrum: hem groupA strep, viridian’s strep, s. aureus, pneumococcus, meningococcus, Gram positive bacillus, spirochetes, read more
Phenoxymethylpenicillin (Penicillin V)
spectrum similar to Penicillin G, for minor and medium infections, AE: cutaneous allergic reactions, doses are double compared to Penicillin G, adm orally one hour before meal, every 6 hours.
Procaine Penicillin
Spectrum similar to Penicillin G, high risk of allergies, single IM administration per day
Benzathine penicilline
Spectrum similar to penicillin G, I: hemolytic streptococcus, prophylaxis of rheumatic fever, syphilis, only IM never IV (risk of PE), not for children under 3
Methicillin
first drug from B-lactamase resistant penicillin group, not used anymore because it is nephrotoxic
Oxacillin
spectrum: staph which produce B lactamases, read more.
Ampicillin and Amoxicillin
read more
Ticarcillin
Spectrum: piocianic bacillus, proteus, serratia, administered parenterally
Mezlocillin
Spectrum: H. influenzae. E. coli, salmonella, proteus marabilis, enterococci, pneumococci; I: genito-urinary infections, biliary infections with Gram negative bacilli (in association with ahminoglycosides), adm. parenterally.
Azlocillin
first choice in severe infections with piocianic bacillus in association with an amino glycoside or Ciprofloxacin
Piperacillin
Spectrum: piocianic bacillus, b. fragilis, serratia, proteus, enterobacter; I: urinary, biliary, meningitis, adm parenterally
BLIS
read more
Imipenem
BLI, spectrum: very wide, all bacteria, beta lactase producing bacteria, penicillin resistant pneumococci, piocianic bacillus, penetrate bacterial wall, bind to PBPs, produce intense bactericidal effect, diffuse well in tissues, penetrate CSL, eliminated 90% by urine
Cephalosporins
read more
Monobactams
only one betalactam ring, spectrum: gram negative aerobes, highly affect piocianic bacteria, well concentrated in biles and tissues, eliminated by kidney, adm IV, IM
Tribactam
3 betalactam rings, only used in labs, spectrum: gram positive and negative aerobes, anaerobes (bactericidal), resistant to beta lactamases
Aminoglycosides - first gen
streptomycin, kanamycin, neomycin, spectinomycin
AGZ second gen
gentamicin, tobramycin
AGZ third gen
amikacin
Aminoglycosides
read more
Old macrocodes
Erythromycin, oleandomycin, josamycin, spiramycin
New macrolides
Roxithromycin, clarithromycin, dirithromycin, azithromycin, rokithromycin
Sinergistine (macrolide)
pristinamycin, virginamycin
Macrolides
wide spectrum and good tissular diffusion, enter inside cells so efficient against intracellular germs (chlamydia, mycoplasma, legionella), low toxicity, can be used in pregnancy, children under 3, and in elderly with CRI, high half life they are adm twice or once daily with good compliance