Major Classes of Antibiotics Flashcards
Group of powerful antibiotics used to
treat serious infections caused by
gram-negative aerobic bacilli
Aminoglycosides
amikacin, gentamicin, kanamycin,
neomycin, streptomycin, tobramycin
Aminoglycosides
Therapeutic Actions and Indications for Aminoglycosides.
- Inhibit protein synthesis in susceptible strains of gram-negative bacteria
- Irreversibly bind to a unit of a bacteria ribosome. Leading to misreading of a genetic code and cell
death - Treat serious infections caused by susceptible strains of gram-negative bacteria (Pseudomonas
auruginosa, E. coli, Proteus species, Kleibsiella Enterobacter-Serratia group, Citrobacter Species,
and Staphylococcus aureus)
Pharmacokinetics of Aminoglycosides
Are poorly absorbed from the GI tract but rapidly absorbed after intramuscular (IM) injections
Contraindications and Cautions for Aminoglycosides
- Known allergy; Renal or hepatic disease; Preexisting hearing loss; Active herpes or mycobacterial infection; Myasthenia gravis or parkinsonism; Lactation
- Do not use for longer than 7 to 10 days
Adverse effects of Aminoglycosides
- CNS: Ototoxicity (deafness, vestibular paralysis), confusion, depression, disorientation, and numbness, tingling, and weakness
- Nephrotoxicity
- GI effects: nausea, vomiting, diarrhea, weight loss, stomatitis, and hepatic toxicity
- Cardiac: palpitations, hypotension, and hypertension
- Hypersentivity: purpura, rash, urticarial, and exfoliative dermatitis
Clinically important drug-drug interactions for Aminoglycosides
- Synergistic bactericidal effect when given with penicillin,
cephalosporins, or ticarcillin - Avoid combining with diuretics, anesthetics
- Are relatively new class of broad-spectrum antibiotics effective against gram-positive and gram-negative bacteria
- meropenem, diropenem, ertapenem, imipenemclistatin
Carbapenems
Therapeutic Actions and Indications for Carbapenems
- Bactericidal
- Inhibit cell membrane synthesis in susceptible bacteria, leading to
cell death - Treat serious infections caused by susceptible strains of S. pneumoniae,Haemophilus influenzae, Moraxella catarrhalis, S.
aureus, Streptococcus pyogenes, E. coli, Peptostreptococcus,
Klebsiella pneumoniae, Clostridium clostridiiforme, Eubacterium
lentum, Bacteroides fragilis, Bacteroides distasonis, Bacteroides
ovatus, Bacteroides thetaiotamicron,, Bacteroides uniformis,
Proteus mirabilis, P. aeruginosa, Acinetobacter baumannii,
Streptococcus agalactiae, Porphyromonas asaccharolytica,
Prevotella bivia - Indicated for treatment of serious intra-abdominal, urinary tract, skin
and skin structure, bone and joint and gynecological infections
Pharmacokinetics of Carbapenems
Rapidly absorbed if given IM
- Contraindications and cautions of Carbapenems
- Known allergy; seizure disorders; meningitis; lactation
- Not for use in patients younger than 18 years old (ertapenem)
- Used with caution in patients with inflammatory bowel disorders (meropenem)
Adverse effects of Carbapenems
- GI: pseudomembranous colitis, Clostridium difficile diarrhea, and nausea and vomiting
- Superinfections
- CNS: headache, dizziness, and altered mental
state
Clinically important drug-drug interactions for Carbapenems
- Not used with Valproic acid
- Avoid using imipenem with vganciclovir
- Avoid using meropenem with probenecid
What major class of Antibiotic has 4 generations?
Cephalosporins
- Effective against gram-positive bacteria that are affected by penicillin G, as well as the gram-negative
bacteria P. mirabilis, E. coli, and K. pneumoniae - cefadroxil, cefazolin, cephalexin
First generation of Cephalosporins
- Effective against previously mentioned strain as well
as H. influenza, Enterobacter aerogenes, and Neisseria species - cefaclor, cefoxitin, cefprozil, cefuroxime
Second generation of Cephalosporins
- Effective against all of the previously mentioned strains, as well as gram-negative bacilli Serratia marcescens
- cefdinir, cefotaxime, ceftibuten, ceftizoxime, ceftriaxone
Third generation cephalosporins
- active against gram-negative and gram-positive organisms including cephalosporin resistant staphylococci
and P. aeruginosa - cefditoren, ceftaroline, cefipime
Fourth generation cephalosporins
Therapeutic Actions and Indications for
Cephalosporins
- Bactericidal and bacteriostatic
- Interfere with cell wall-building ability of bacteria when they divide, that is, they prevent the bacteria from
biosynthesizing the framework of their call walls. The bacteria with weakened cell walls swell and burst as a
result of osmotic pressure within the cell. - Indicated for the treatment of infections caused by susceptible bacteria
Pharmacokinetics of: Cephalosporins
Well absorbed from the GI tract, some IM or IV administration
Contraindications and Cautions for: Cephalosporins
Pharmacokinetics
Adverse effects of: Cephalosporins
- GI: nausea, vomiting, diarrhea, anorexia, abdominal pain, and flatulence, pseudomembranous colitis, bloody diarrhea or abdominal pain
- CNS: headache, dizziness, lethargy, and paresthesias
- Nephrotoxicity, superinfections
Clinically important drug-drug interactions for: Cephalosporins
- Cephalosporins and aminoglycosides increases risk for nephrotoxicity (check BUN and creatinine levels)
- May increase bleeding if given with anticoagulants
- Avoid alcohol for 72 hours after discontinuing the drug
Therapeutic Actions and Indications for: Fluoroquinolones
- interfere with the action of DNA enzymes necessary for the growth and reproduction of the bacteria leading to cell death
- indicated for treating infections caused by susceptible strains of gram-negative bacteria, including E. coli, P.
mirabilis, K. pneumoniae, Enterobacter cloacae, Proteus vulgaris, Proteus rettgeri, Morganella morganii, M. catarrhalis, H. infl uenzae, H.
parainfluenzae, P. eruginosa, Citrobacter freundii, S. aureus, Staphylococcus epidermidis, some Neisseria gonorrhoeae, and group D streptococci infections
frequently include urinary tract, respiratory tract, and
skin infections - anthrax infection, typhoid fever
Pharmacokinetics of: Fluoroquinolones
Absorbed in the GI tract, metabolized in the liver, and excreted in the urine and feces
Contraindications and Cautions for: Fluoroquinolones
- Known allergy; pregnant and lactating
patients - Caution with renal dysfunction
Adverse effects of: Fluoroquinolones
- CNS: Headache, dizziness, insomnia, and depression
- GI: nausea, vomiting, diarrhea, and dry mouth
- Tendinitis and Tendon rupture
- Immune: bone marrow depression
- Others: fever, rash, and photosensitivity
Clinically important drug-drug interactions for: Fluoroquinolones
- Decreased with iron salts, sucralfate, mineral supplements, or antacids
- Cardiac reactions: quinidine, procainamide, amiodarone, sotalol, erythromycin, terfenadine,
pentamidine, tricyclics, phenothiazines) - Increased theophylline levels if taken together
- Increased tendonitis and tendon rupture with corticosteroid
was the first antibiotic introduced for clinical use.
Penicillin and Penicillinase Resistant antibiotics
He used Penicillium molds to produce the original penicillin in the 1920s.
Sir Alexander Fleming
penicillin G benzathine, penicillin G potassium, penicillin G procaine, penicillin V, amoxicillin,
and ampicillin
Penicillin and Penicillinase Resistant antibiotics
Therapeutic Actions and Indications for: Penicillin and Penicillinase Resistant antibiotics
- Produce bactericidal effects by interfering with the ability of susceptible bacteria to build their cell
walls when they are dividing - indicated for the treatment of streptococcal infections, including pharyngitis, tonsillitis, scarlet
fever, and endocarditis; pneumococcal infections; staphylococcal infections; fusospirochetal infections; ratbite fever; diphtheria; anthrax; syphilis; and uncomplicated gonococcal infections,
meningococcal meningitis
Pharmacokinetics of: Penicillin and Penicillinase Resistant antibiotics
- rapidly absorbed from the GI tract, reaching peak levels in 1 hour. They are sensitive to the gastric acid levels in the stomach and should be taken on
an empty stomach to ensure adequate absorption
Contraindications and Cautions for: Penicillin and Penicillinase Resistant antibiotics
- Known allergy
- Caution with renal dysfunction
Adverse effects of: Penicillin and Penicillinase Resistant antibiotics
- GI: nausea, vomiting, diarrhea, abdominal pain, glossitis, stomatitis, gastritis, sore mouth, and furry
tongue - Hypersensitivity: fever, rash, wheezing and anaphylaxis