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Antimicrobial Spectrum, Dosing Information, and Adverse Reaction Return to Top

Antibiotic Agent Antimicrobial Spectrum Dosing Information Notable Adverse Reaction
Amikacin
  • Escherichia coli
  • Klebsiella
  • Proteus
  • Enterobacter
  • Serratia
  • Pseudomonas
  • Neonates (postnatal age ≤ 7 days): 7.5 mg/kg q 12-18 hr IV or IM (≤ 2,000 g); 10 mg/kg q 12 hr IV or IM (> 2,000 g)
  • Neonates (postnatal age > 7 days): 7.5 mg/kg q 8-12 hr IV or IM (≤ 2,000 g); 10 mg/kg q 8 hr IV or IM (> 2,000 g)
  • Children: 15-25 mg/kg/24 hr divided q 8-12 hr IV or IM
  • Adults: 15 mg/kg 24 hr divided q 8-12 hr IV or IM
  • Ototoxicity
  • Nephrotoxicity
Amoxicillin
  • Gram-positive pathogens except Staphylococcus
  • Salmonella
  • Shigella
  • Neisseria
  • E. coli
  • Proteus mirabilis
  • Children: 20-50 mg/kg/24 hr divided q 8-12 hr PO. Higher dose of 80-90 mg/kg 24 hr PO for otitis media
  • Adults: 250-500 mg q 8-12 hr PO
  • Rash
  • Diarrhea
  • Cramping
Amoxicillin-Clavulanate
  • S. aureus, methicillin-susceptible
  • Streptococcus
  • Haemophilus influenzae
  • Moraxella catarrhalis
  • E. coli
  • Klebsiella
  • Bacteroides fragilis
  • Neonates: 30 mg/kg/24 hr divided q 12 hr PO.
  • Children: 20-45 mg/kg 24 hr divided q 8-12 hr PO. Higher dose 80-90 mg/kg/24 hr PO for otitis media.
  • Diarrhea
  • Rash
Ampicillin
  • Gram-positive pathogens except Staphylococcus
  • Salmonella
  • Shigella
  • Neisseria
  • E. coli
  • Proteus mirabilis
  • Neonates (postnatal age ≤ 7 days): 50 mg/kg/24 hr IV or IM q 12 hr (≤ 2,000 g); 75 mg/kg/24 hr divided q 8 hr IV or IM (> 2,000 g)
  • Neonates (postnatal age > 7 days): 50 mg/kg/24 hr IV or IM q 12 hr (< 1,200 g); 75 mg/kg/24 hr divided q 8 hr IV or IM (1,200–2,000 g); 100 mg/kg/24 hr divided q 6 hr IV or IM (> 2,000 g)
  • Children: 100-200 mg/kg/24 hr divided q 6 hr IV or IM
  • Adults: 250-500 mg q 4-8 hr IV or IM
  • Diarrhea
Ampicillin-Sulbactam
  • S. aureus
  • H. influenzae
  • M. catarrhalis
  • E. coli
  • Klebsiella
  • B. fragilis
  • Children: 100-200 mg/kg/24 hr divided q 4-8 hr IV or IM
  • Adults: 1-2 g q 6-8 hr IV or IM (max daily dose: 8 g)
  • Diarrhea
  • Rash
Azithromycin
  • S. aureus
  • Streptococcus
  • H. influenzae
  • Mycoplasma
  • Legionella
  • Chlamydia trachomatis
  • Children: 10 mg/kg PO on day 1 (max dose: 500 mg) followed by 5 mg/kg PO q 24 hr for 4 days.
  • Adults: 500 mg PO day 1 followed by 250 mg for 4 days.
  • Gastrointestinal distress
Aztreonam
  • Gram-negative aerobic bacteria
  • Enterobacteriaceae
  • Pseudomonas aeruginosa
  • Neonates (postnatal age ≤ 7 days): 60 mg/kg/24 hr divided q 12 hr IV or IM (≤ 2,000 g); 90 mg/kg/24 hr divided q 8 hr IV or IM (> 2,000 g)
  • Neonates (postnatal age > 7 days): 60 mg/kg/24 hr divided q 12 hr IV or IM (< 1,200 g); 90 mg/kg/24 hr divided q 8 hr IV or IM (1,200–2,000 g); 120 mg/kg/24 hr divided q 6-8 hr IV or IM (> 2,000 g)
  • Children: 90-120 mg/kg/24 hr divided q 6-8 hr IV or IM
  • Adults: 1-2 g IV or IM q 8-12 hr (max dose: 8 g/24 hr)
  • Rash
  • Thrombophlebitis
  • Eosinophilia
Carbenicillin
  • Enterobacter
  • Proteus
  • Pseudomonas
  • Neonates (postnatal age ≤ 7 days): 225 mg/kg/24 hr divided q 8 hr IV or IM (≤ 2,000 g); 300 mg/kg/24 hr divided q 6 hr IV or IM (> 2,000 g)
  • Neonates (postnatal age > 7 days): 300-400 mg/kg/24 hr divided q 6 hr IV or IM
  • Children: 400-600 mg/kg/24 hr divided q 4-6 hr IV or IM
  • Rash
  • Liver transaminases elevation
Cefaclor
  • S. aureus
  • S. pneumoniae
  • H. influenzae
  • E. coli
  • Klebsiella
  • Proteus
  • Children: 20-40 mg/kg/24 hr divided q 8-12 hr PO (max dose: 2 g)
  • Adults: 250-500 mg q 6-8 hr PO
  • Rash
  • Eosinophilia
  • Serum sickness-like reaction
Cefadroxil
  • S. aureus
  • Streptococcus
  • E. coli
  • Klebsiella
  • Proteus
  • Children: 30 mg/kg/24 hr divided q 12 hr PO (max dose: 2 g)
  • Adults: 250-500 mg q 8-12 hr PO
  • Rash
  • Eosinophilia
Cefazolin
  • S. aureus
  • Streptococcus
  • E. coli
  • Klebsiella
  • Proteus
  • Neonates (postnatal age ≤ 7 days): 40 mg/kg/24 hr divided q 12 hr IV or IM
  • Neonates (postnatal age > 7 days): 40-60 mg/kg/24 hr divided q 8 hr IV or IM
  • Children: 50-100 mg/kg/24 hr divided q 8 hr IV or IM
  • Adults: 0.5-2g q 8 hr IV or IM (max dose: 12 g/24 hr)
  • Rash
  • Eosinophilia
Cefdinir
  • Extended-spectrum cephalosporin
  • Children: 14 mg/kg/24 hr in 1 or 2 doses PO (max dose: 600 mg/24 hr)
  • Adults: 600 mg q 24 hr PO
  • Diarrhea
Cefepime
  • Gram-positive bacteria
  • Gram-negative bacteria including P. aeruginosa
  • Children: 100-150 mg/kg/24 hr q 8-12 hr IV or IM
  • Adults: 2-4 g/24 hr q 12 hr IV or IM
  • Diarrhea
  • Nausea
  • Vaginal candidiasis
  • Rash
  • Eosinophilia
Cefixime
  • Streptococci
  • H. influenzae
  • M. catarrhalis
  • Neisseria gonorrhoeae
  • Serratia marcescens
  • P. vulgaris
  • Children: 8 mg/kg/24 hr divided q 12-24 hr PO
  • Adults: 400 mg/24 hr divided q 12-24 hr PO
  • Rash
  • Eosinophilia
Cefoperazone
  • Gram-positive pathogens
  • Gram-negative pathogens
  • Neonates: 100 mg/kg/24 hr divided q 12 hr IV or IM
  • Children: 100-150 mg/kg/24 hr divided q 8-12 hr IV or IM
  • Adults: 2-4 g/24 hr divided q 8-12 hr IV or IM (max dose: 12 g/24 hr)
  • Hypoprothrombinemia
  • Disulfiram-life reaction
Cefotaxime
  • Gram-positive pathogens
  • Gram-negative pathogens
  • Neonates (postnatal age ≤ 7 days): 100 mg/kg/24 hr divided q 12 hr IV or IM
  • Neonates (postnatal age > 7 days): 100 mg/kg/24 hr divided q 12 hr IV or IM (< 1,200 g); 150 mg/kg/24 hr divided q 8 hr IV or IM (> 1,200 g)
  • Children: 150 mg/kg/24 hr divided q 6-8 hr IV or IM
  • Adults: 1-2 g q 8-12 hr IV or IM (max dose: 12 g/24 hr)
  • Rash
  • Eosinophilia
Cefotetan
  • S. aureus
  • Streptococcus
  • H. influenzae
  • E. coli
  • Klebsiella
  • Proteus
  • Bacteroides
  • Children: 40-80 mg/kg/24 hr divided IV or IM q 12 hr
  • Adults: 2-4 g/24 hr divided q 12 hr IV or IM (max dose: 6 g/24 hr)
  • Rash
  • Eosinophilia
  • Hypoprothrombinemia
  • Disulfiram-life reaction
Cefoxitin
  • S. aureus
  • Streptococcus
  • H. influenzae
  • E. coli
  • Klebsiella
  • Proteus
  • Bacteroides
  • Neonates: 70-100 mg/kg/24 hr divided q 8-12 hr IV or IM
  • Children: 80-160 mg/kg/24 hr divided q 6-8 hr IV or IM
  • Adults: 1-2 g q 6-8 hr IV or IM (max dose: 12 g/24 hr)
  • Rash
  • Eosinophilia
Cefpodoxime
  • S. aureus
  • Streptococcus
  • H. influenzae
  • M. catarrhalis
  • N. gonorrhoeae
  • E. coli
  • Klebsiella
  • Proteus
  • Children: 10 mg/kg/24 hr divided q 12 hr PO
  • Adults: 200-800 mg/24 hr divided q 12 hr PO (max dose: 800 mg/24 hr)
  • Rash
  • Eosinophilia
Cefprozil
  • S. aureus
  • Streptococcus
  • H. influenzae
  • E. coli
  • M. catarrhalis
  • Klebsiella
  • Proteus
  • Children: 30 mg/kg/24 hr divided q 8-12 hr PO
  • Adults: 500-1,000 mg/24 hr divided q 12 hr PO (max dose: 1.5 g/24 hr)
  • Rash
  • Eosinophilia
Ceftazidime
  • Gram-positive pathogens
  • Gram-negative pathogens including P. aeruginosa
  • Neonates (postnatal age ≤ 7 days): 100 mg/kg/24 hr divided q 12 hr IV or IM
  • Neonates (postnatal age > 7 days): 100 mg/kg/24 hr divided q 12 hr IV or IM (< 1,200 g); 150 mg/kg/24 hr divided q 8 hr IV or IM (> 1,200 g)
  • Children: 150 mg/kg/24 hr divided q 8 hr IV or IM
  • Adults: 1-2 g q 8-12 hr IV or IM (max dose: 8-12 g/24 hr)
  • Rash
  • Eosinophilia
Ceftiaoxime
  • Gram-positive pathogens
  • Gram-negative pathogens
  • Children: 150 mg/kg/24 hr divided q 6-8 hr IV or IM
  • Adults: 1-2 g q 6-8 hr IV or IM (max dose: 12 g/24 hr)
  • Rash
  • Eosinophilia
Ceftriaxone
  • Gram-positive pathogens
  • Gram-negative pathogens
  • Neonates: 50-75 mg/kg q 24 hr IV or IM
  • Children: 50-75 mg/kg q 24 hr IV or IM
  • Adults: 1-2 g q 24 hr IV or IM (max dose: 4 g/24 hr)
  • Rash
  • Eosinophilia
Cefuroxime
  • S. aureus
  • Streptococcus
  • H. influenzae
  • E. coli
  • M. catarrhalis
  • Klebsiella
  • Proteus
  • Neonates: 40-100 mg/kg/24 hr divided q 12 hr IV or IM
  • Children: 200-240 mg/kg/24 hr divided q 8 hr IV or IM; 20-30 mg/kg/24 hr divided q 8 hr PO
  • Adults: 750-1,500 mg q 8 hr IV or IM (max dose: 6 g/24 hr)
  • Rash
  • Eosinophilia
Cephalexin
  • S. aureus
  • Streptococcus
  • E. coli
  • Klebsiella
  • Proteus
  • Children: 25-100 mg/kg/24 hr divided q 6-8 hr PO
  • Adults: 250-500 mg q 6 hr PO (max dose: 4 g/24 hr)
  • Rash
  • Eosinophilia
Cephradine
  • S. aureus
  • Streptococcus
  • E. coli
  • Klebsiella
  • Proteus
  • Children: 50-100 mg/kg/24 hr divided q 6-12 hr PO
  • Adults: 250-500 mg q 6-12 hr PO (max dose: 4 g/24 hr)
  • Rash
  • Eosinophilia
Chloramphenicol
  • Gram-positive pathogens
  • Salmonella
  • Enterococcus faecium
  • Bacteroides
  • Mycoplasma
  • Chlamydia
  • Rickettsia
  • Neonates: loading dose of 20 mg/kg followed by
  • Neonates (postnatal age ≤ 7 days): 25 mg/kg/24 hr q 24 hr IV
  • Neonates (postnatal age > 7 days): 25 mg/kg/24 hr q 24 hr IV (< 2,000 g); 50 mg/kg/24 hr divided q 12 hr IV (> 2,000 g)
  • Children: 50-75 mg/kg/24 hr divided q 6-8 hr IV or PO
  • Adults: 50 mg/kg/24 hr divided q 6 hr IV or PO (max dose: 4 g/24 hr)
  • Gray-baby syndrome
  • Bone marrow suppression
  • Aplastic anemia
Ciprofloxacin
  • P. aeruginosa
  • Serratia
  • Enterobacter
  • Shigella
  • Salmonella
  • Campylobacter
  • N. gonorrhoeae
  • H. influenzae
  • M. catarrhalis
  • Neonates: 10 mg/kg q 12 hr PO or IV
  • Children: 15-30 mg/kg/24 hr divided q 12 hr PO or IV
  • Adults: 250-750 mg q 12 hr; 200-400 mg IV q 12 hr PO (max dose: 1.5 g/24 hr)
  • Tendonitis
  • Dizziness
  • Confusion
  • Crystalluria
  • Photosensitivity
Clarithromycin
  • S. aureus
  • Streptococcus
  • H. influenzae
  • Legionella
  • Mycoplasma
  • C. trachomatis
  • Children: 15 mg/kg/24 hr divided q 12 hr PO
  • Adults: 250-500 mg q 12 hr PO (max dose: 1 g/24 hr)
  • Gastrointestinal distress
  • Dyspepsia
  • Nausea
  • Cramping
Clindamycin
  • Gram-positive aerobic pathogens
  • Anaerobic cocci except Enterococcus
  • Neonates (postnatal age ≤ 7 days): 10 mg/kg/24 hr divided q 12 hr IV or IM (≤ 2,000 g); 15 mg/kg/24 hr divided q 8 hr IV or IM (> 2,000 g)
  • Neonates (postnatal age > 7 days): 10 mg/kg/24 hr IV or IM divided q 12 hr (≤ 1,200 g); 15 mg/kg/24 hr divided q 8 hr IV or IM (1,200–2,000 g); 20 mg/kg/24 hr divided q 8 hr IV or IM (> 2,000 g)
  • Children: 10-40 mg/kg/24 hr divided q 6-8 hr IV, IM, or PO
  • Adults: 150-600 mg q 6-8 hr IV, IM, or PO (max dose: 5 g/24 hr IV or IM or 2 g/24 hr PO)
  • Diarrhea
  • Nausea
  • Pseudomembranous colitis
  • Rash
Cloxacillin
  • S. aureus and other gram-positive cocci except Enterococcus and coagulase-negative staphylococci
  • Children: 50-100 mg/kg/24 hr divided q 6 hr PO
  • Adults: 250-500 mg q 6 hr PO (max dose: 4 g/24 hr)
  • Rash
  • Eosinophilia
Trimethoprim-Sulfamethoxazole
  • Shigella
  • Legionella
  • Nocardia
  • Chlamydia
  • Pneumocystis jirovecii
  • Children: 6-20 mg TMP/kg/24 hr or IV divided q 12 hr PO
  • Adults: 160 mg TMP q 12 hr PO
  • Rash
  • Erythema multiforme
  • Stevens-Johnson syndrome
  • Nausea
  • Leukopenia
Demeclocycline
  • Gram-positive cocci except Enterococcus
  • Gram-negative bacilli
  • Anaerobes
  • Borrelia burgdorferi
  • Mycoplasma
  • Chlamydia
  • Children: 8-12 mg/kg/24 hr divided q 6-12 hr PO
  • Adults: 150 mg PO q 6-8 hr
  • Teeth staining
  • Photosensitivity
  • Diabetes insipidus
  • Nausea
  • Vomiting
  • Diarrhea
Dicloxacillin
  • S. aureus and other gram-positive cocci except Enterococcus and coagulase-negative staphylococci
  • Children: 12.5-100 mg/kg/24 hr divided q 6 hr PO
  • Adults: 125-500 mg q 6 hr PO
  • Rash
  • Eosinophilia
Doripenem
  • Gram-positive cocci
  • Gram-negative bacilli including P. aeruginosa
  • Anaerobes
  • Adults: 500 mg q 8 hr IV
  • Rash
  • Eosinophilia
Doxycycline
  • Gram-positive cocci except Enterococcus
  • Gram-negative bacilli
  • Anaerobes
  • B. burgdorferi
  • Mycoplasma
  • Chlamydia
  • Children: 2-5 mg/kg/24 hr divided q 12-24 hr PO or IV (max dose: 200 mg/24 hr)
  • Adults: 100-200 mg/24 hr divided q 12-24 hr PO or IV
  • Teeth staining
  • Photosensitivity
  • Nausea
  • Vomiting
  • Diarrhea
Erythromycin
  • Gram-positive organisms
  • Corynebacterium diphtheriae
  • Mycoplasma pneumoniae
  • Neonates (postnatal age ≤ 7 days): 20 mg/kg/24 hr divided q 12 hr PO
  • Neonates (postnatal age > 7 days): 20 mg/kg/24 hr divided q 12 hr PO (< 1,200 g); 30 mg/kg/24 hr divided q 8 hr PO (> 1,200 g)
  • Children: Usual max dose 2 g/24 hr. Base: 30-50 mg/kg/24 hr divided q 6-8 hr PO. Estolate: 30-50 mg/kg/24 hr divided q 8-12 hr PO. Stearate: 20-40 mg/kg/24 hr divided q 6 hr PO. Lactobionate: 20-40 mg/kg/24 hr divided q 6-8 hr IV. Gluceptate: 20-50 mg/kg/24 hr divided q 6 hr IV; usual max dose 4 g/24 hr IV
  • Adults: Base: 333 mg PO q 8 hr; estolate/stearate/base: 250-500 mg q 6 hr PO
  • Cramping
  • Nausea
  • Vomiting
  • Diarrhea
  • Hypertrophic pyloric stenosis
Gentamicin
  • E. coli
  • Klebsiella
  • Proteus
  • Enterobacter
  • Serratia
  • Pseudomonas
  • Neonates (postnatal age ≤ 7 days): 2.5 mg/kg q 12-18 hr IV or IM (< 2,000 g); 2.5 mg/kg q 12 hr IV or IM (> 2,000 g)
  • Neonates (postnatal age > 7 days): 2.5 mg/kg q 8-12 hr IV or IM (< 2,000 g); 32.5 mg/kg q 8 hr IV or IM (> 2,000 g)
  • Children: 2.5 mg/kg/24 hr divided q 8-12 hr IV or IM; 5-7.5 mg/kg/24 hr IV once daily
  • Adults: 3-6 mg/kg/24 hr divided q 8 hr IV or IM
  • Ototoxicity
  • Nephrotoxicity
Imipenem-Cilastatin
  • Gram-positive cocci
  • Gram-negative bacilli including P. aeruginosa
  • Anaerobes
  • Neonates (postnatal age ≤ 7 days): 20 mg/kg q 18-24 hr IV or IM (< 1,200 g); 40 mg/kg divided q 12 hr IV or IM (> 1,200 g)
  • Neonates (postnatal age > 7 days): 40 mg/kg q 12 hr IV or IM (< 2,000 g); 60 mg/kg q 8 hr IV or IM (> 2,000 g)
  • Children: 60-100 mg/kg/24 hr divided q 6-8 hr IV or IM
  • Adults: 2-4 g/24 hr divided q 6-8 hr IV or IM (max dose: 4 g/24 hr)
  • Rash
  • Eosinophilia
  • Nausea
  • Seizures
Linezolid
  • Staphylococcus
  • Streptococcus
  • E. faecium
  • Enterococcus faecalis
  • Children: 10 mg/kg q 12 hr IV or PO
  • Adults: Pneumonia: 600 mg q 12 hr IV or PO
  • Bone marrow suppression
  • Pseudomembranous colitis
  • Nausea
  • Diarrhea
  • Headache
Loracarbef
  • S. aureus
  • Streptococcus
  • H. influenzae
  • M. catarrhalis
  • E. coli
  • Klebsiella
  • Proteus
  • Children: 30 mg/kg/24 hr divided q 12 hr PO (max dose: 2 g)
  • Adults: 200-400 mg q 12 hr PO (max dose: 800 mg/24 hr)
  • Rash
  • Eosinophilia
Meropenem
  • Gram-positive cocci
  • Gram-negative bacilli including P. aeruginosa
  • Anaerobes
  • Children: 60 mg/kg/24 hr divided q 8 hr IV
  • Adults: 1.5-3 g q 8 hr IV
  • Rash
  • Eosinophilia
Metronidazole
  • Anaerobes
  • Neonates (postnatal age ≤ 7 days): 7.5 mg/kg 48 hr PO or IV (< 1,200 g); 7.5 mg/kg/24 hr q 24 hr PO or IV (1,200–2,000 g); 15 mg/kg/24 hr divided q 12 hr PO or IV (> 2,000 g)
  • Neonates (postnatal age > 7 days): 5 mg/kg/24 hr divided q 12 hr PO or IV (< 2,000 g); 30 mg/kg/24 hr divided q 12 hr PO or IV (> 2,000 g)
  • Children: 30 mg/kg/24 hr divided q 6-8 hr PO or IV
  • Adults: 30 mg/kg/24 hr divided q 6 hr PO or IV (max dose: 4 g/24 hr)
  • Dizziness
  • Seizures
  • Metallic taste
  • Nausea
  • Hypoprothrombinemia
  • Disulfiram-like reaction
Mezlocillin
  • E. coli
  • Enterobacter
  • Serratia
  • Bacteroides
  • Neonates (postnatal age ≤ 7 days): 150 mg/kg/24 hr divided q 12 hr IV
  • Neonates (postnatal age > 7 days): 225 mg/kg divided q 8 hr IV
  • Children: 200-300 mg/kg/24 hr divided q 4-6 hr IV
  • Adults: 2-4 g/dose q 4-6 hr IV (max dose: 12 g/24 hr)
  • Rash
  • Eosinophilia
  • Liver transaminases elevation
Mupirocin
  • Staphylococcus
  • Streptococcus
  • Topical application to the skin 2-4 times per day
  • Itching
Nafcillin
  • S. aureus and other gram-positive cocci except Enterococcus and coagulase-negative staphylococci
  • Neonates (postnatal age ≤ 7 days): 50 mg/kg/24 hr divided q 12 hr IV or IM (< 2,000 g); 75 mg/kg/24 hr divided q 8 hr IV or IM (> 2,000 g)
  • Neonates (postnatal age > 7 days): 75 mg/kg/q 8 hr IV (< 2,000 g); 100 mg/kg divided q 6-8 hr IV (> 2,000 g)
  • Children: 100-200 mg/kg/24 hr divided q 4-6 hr IV
  • Adults: 4-12 g/24 hr divided q 4-6 hr IV (max dose: 12 g/24 hr)
  • Rash
  • Eosinophilia
  • Phlebitis
  • Neutropenia
Nalidixic acid
  • E. coli
  • Enterobacter
  • Klebsiella
  • Proteus
  • Children: 50-55 mg/kg/24 hr divided q 6 hr PO; suppressive therapy 25-33 mg/kg/24 hr divided q 6-8 hr PO
  • Adults: 1 g q 6 hr PO; suppressive therapy: 500 mg q 6 hr PO
  • Vertigo
  • Dizziness
  • Rash
Neomycin
  • Gastrointestinal flora
  • Infants: 50 mg/kg/24 hr divided q 6 hr PO
  • Children: 50-100 mg/kg/24 hr divided q 6-8 hr PO
  • Adults: 500-2,000 mg/dose q 6-8 hr PO
  • Cramping
  • Diarrhea
  • Rash
  • Ototoxicity
  • Nephrotoxicity
Nitrofurantoin
  • Gram-positive pathogens
  • Gram-negative pathogens
  • Children: 5-7 mg/kg/24 hr divided q 6 hr PO (max dose: 400 mg/24 hr); suppressive therapy 1-2.5 mg/kg/24 hr divided q 12-24 hr PO (max dose: 100 mg/24 hr)
  • Adults: 50-100 mg/24 hr divided q 6 hr PO
  • Vertigo
  • Dizziness
  • Rash
  • Jaundice
  • Interstitial pneumonitis
Ofloxacin
  • Gram-positive pathogens
  • Gram-negative pathogens
  • Anaerobes
  • Chlamydia trachomatis
  • Child (< 12 yr): Conjunctivitis: 1-2 drops in affected eye(s) q 2-4 hr for 2 days, then 1-2 drops qid for 5 days. Corneal ulcers: 1-2 drops q 30 min while awake and at 4 hours at night for 2 days, then 1-2 drops hourly for 5 days while awake, then 1-2 drops q 6 hr for 2 days. Otitis externa: 5 drops into affected ear bid for 10 days
  • Child (> 12 yr) and adults: Ophthalmic solution doses same as for younger children. Otitis externa: 10 drops bid for 10–14 days as for younger children
  • Burning
  • Stinging
  • Eye redness
  • Dizziness
Oxacillin
  • S. aureus and other gram-positive cocci except Enterococcus and coagulase-negative staphylococci
  • Neonates (postnatal age ≤ 7 days): 50 mg/kg/24 hr divided q 12 hr IV (< 2,000 g); 75 mg/kg/24 hr IV divided q 8 hr IV (> 2,000 g)
  • Neonates (postnatal age > 7 days): 50 mg/kg/24 hr IV divided q 12 hr IV (< 1,200 g); 75 mg/kg/24 hr divided q 8 hr IV (1,200–2,000 g); 100 mg/kg/24 hr IV divided q 6 hr IV (> 2,000 g)
  • Infants: 100-200 mg/kg/24 hr divided q 4-6 hr IV
  • Children: PO 50-100 mg/kg/24 hr divided q 4-6 hr IV
  • Adults: 2-12 g/24 hr divided q 4-6 hr IV (max dose: 12 g/24 hr)
  • Rash
  • Eosinophilia
  • Neutropenia
Penicillin G
  • S. pneumoniae
  • Group A Streptococcus
  • N. gonorrhoeae
  • N. meningitidis
  • Neonates (postnatal age ≤ 7 days): 50,000 units/kg/24 hr divided q 12 hr IV or IM (< 2,000 g); 75,000 units/kg/24 hr divided q 8 hr IV or IM (> 2,000 g)
  • Neonates (postnatal age > 7 days): 50,000 units/kg/24 hr divided q 12 hr IV (< 1,200 g); 75,000 units/kg/24 hr q 8 hr IV (1,200–2,000 g); 100,000 units/kg/24 hr divided q 6 hr IV (> 2,000 g)
  • Children: 100,000-250,000 units/kg/24 hr divided q 4-6 hr IV or IM (max dose: 400,000 units/kg/24 hr)
  • Adults: 2-24 million units/24 hr divided q 4-6 hr IV or IM
  • Rash
  • Eosinophilia
  • Allergy
  • Seizures
Penicillin G, benzathine
  • Group A Streptococcus
  • Neonates: 50,000 units/kg IM once
  • Children: 300,000-1.2 million units/kg q 3-4 wk IM (max dose: 1.2-2.4 million units/dose)
  • Adults: 1.2 million units IM q 3-4 wk
  • Rash
  • Eosinophilia
  • Allergy
Penicillin G, procaine
  • Gram-positive pathogens
  • Neonates: 50,000 units/kg/24 hr IM
  • Children: 25,000-50,000 units/kg/24 hr IM for 10 days (max dose: 4.8 million units/dose)
  • Adults: 0.6-4.8 million units q 12-24 hr IM
  • Rash
  • Eosinophilia
  • Allergy
Penicillin V
  • S. pneumoniae
  • N. gonorrhoeae
  • N. meningitidis
  • Children: 25-50 mg/kg/24 hr divided q 4-8 hr PO
  • Adults: 125-500 mg q 6-8 hr PO (max dose: 3 g/24 hr)
  • Rash
  • Eosinophilia
  • Allergy
Piperacillin
  • E. coli
  • Enterobacter
  • Serratia
  • P. aeruginosa
  • Bacteroides
  • Neonates (postnatal age ≤ 7 days): 150 mg/kg/24 hr divided q 8-12 hr IV
  • Neonates (postnatal age > 7 days): 200 mg/kg divided q 6-8 hr IV
  • Children: 200-300 mg/kg/24 hr divided q 4-6 hr IV
  • Adults: 2-4 g/dose q 4-6 hr (max dose: 24 g/24 hr) IV
  • Rash
  • Eosinophilia
  • Serum sickness-like reaction
Piperacillin-Tazobactam
  • S. aureus
  • H. influenzae
  • E. coli
  • Enterobacter
  • Serratia
  • Acinetobacter
  • P. aeruginosa
  • Bacteroides
  • Children: 300-400 mg/kg/24 hr divided q 6-8 hr IV or IM
  • Adults: 3.375 g q 6-8 hr IV or IM
  • Rash
  • Eosinophilia
Quinupristin-Dalfopristin
  • E. faecium, vancomycin-resistant
  • S. aureus, methicillin-resistant
  • Children and adults: 7.5 mg/kg q 8 hr IV
  • Pain
  • Edema
  • Phlebitis
  • Nausea
  • Diarrhea
Sulfadiazine
  • E. coli
  • P. mirabilis
  • Klebsiella
  • Neonates: 100 mg/kg/24 hr divided q 12 hr PO with pyrimethamine 1 mg/kg/24 hr PO with folinic acid
  • Children: 120-200 mg/kg/24 hr divided q 6 hr PO with pyrimethamine 2 mg/kg/24 hr divided q 12 hr PO ≥3 days then 1 mg/kg/24 hr (max dose: 25 mg/24 hr) with folinic acid
  • Rash
  • Stevens-Johnson syndrome
  • Nausea
  • Leukopenia
  • Crystalluria
Sulfamethoxazole
  • Bacteria associated with otitis media, chronic bronchitis, and lower urinary tract infections
  • Children: 50-60 mg/kg/24 hr divided q 12 hr PO
  • Adults: 1 g/dose q 12 hr PO (max dose: 3 g/24 hr)
  • Rash
  • Stevens-Johnson syndrome
  • Nausea
  • Leukopenia
  • Crystalluria
Sulfisoxazole
  • Bacteria associated with otitis media, chronic bronchitis, and lower urinary tract infections
  • Children: 120-150 mg/kg/24 hr divided q 4-6 hr PO (max dose: 6 g/24 hr)
  • Adults: 4-8 g/24 hr divided q 4-6 hr PO
  • Rash
  • Stevens-Johnson syndrome
  • Nausea
  • Leukopenia
  • Crystalluria
Ticarcillin
  • E. coli
  • Enterobacter
  • Serratia
  • P. aeruginosa
  • Bacteroides
  • Neonates (postnatal age ≤ 7 days): 150 mg/kg/24 hr divided q 8-12 hr IV
  • Neonates (postnatal age > 7 days): 150 mg/kg/24 hr divided q 8-12 hr IV (< 1,200 g); 150 mg/kg/24 hr divided q 12 hr IV (1,200–2,000 g); 300 mg/kg/24 hr divided q 6-8 hr IV (> 2,000 g)
  • Children: 200-400 mg/kg/24 hr divided q 4-6 hr IV
  • Adults: 2-4 g/dose q 4-6 hr IV (max dose: 24 g/24 hr)
  • Rash
  • Eosinophilia
  • Liver transaminases elevation
Ticarcillin-Clavulanate
  • S. aureus
  • H. influenzae
  • Enterobacter
  • E. coli
  • Serratia
  • P. aeruginosa
  • Acinetobacter
  • Bacteroides
  • Children: 280-400 mg/kg/24 hr q 4-8 hr IV or IM
  • Adults: 3.1 g q 4-8 hr IV or IM (max dose: 18-24 g/24 hr)
  • Rash
  • Eosinophilia
  • Liver transaminases elevation
Tigecycline
  • Enterobacteriaceae including ESBL producers
  • Streptococcus
  • Staphylococcus
  • Anaerobes
  • Adults: 100 mg loading dose followed by 50 mg q 12 hr IV
  • Photosensitivity
  • Hypersensitivity
  • Hepatic impairment
Tobramycin
  • E. coli
  • Klebsiella
  • Enterobacter
  • Serratia
  • Proteus
  • Pseudomonas
  • Neonates (postnatal age ≤ 7 days): 2.5 mg/kg q12-18 hr IV or IM (< 2,000 g); 2.5 mg/kg q 12 hr IV or IM (> 2,000 g)
  • Neonates (postnatal age > 7 days): 2.5 mg/kg q 8-12 hr IV or IM (< 2,000 g); 2.5 mg/kg q 8 hr IV or IM (> 2,000 g)
  • Children: 2.5 mg/kg/24 hr divided q 8-12 hr IV or IM; 5-7.5 mg/kg/24 hr IV
  • Adults: 3-6 mg/kg/24 hr divided q 8 hr IV or IM
  • Ototoxicity
  • Nephrotoxicity
Trimethoprim
  • E. coli
  • Klebsiella
  • P. mirabilis
  • Enterobacter
  • P. jirovecii
  • Children (< 12 yr): 4-6 mg/kg/24 hr divided q 12 hr PO
  • Children (> 12 yr) and adults: 100-200 mg q 12 hr PO
  • Megaloblastic anemia
  • Bone marrow suppression
  • Nausea
  • Epigastric distress
  • Rash
Vancomycin
  • Gram-positive pathogens including Staphylococcus, S. pneumoniae, and Enterococcus
  • C. difficile
  • Neonates (postnatal age > 7 days): 15 mg/kg/24 hr divided q 24 hr IV (< 1,200 g); 15 mg/kg/24 hr divided q 12-18 hr IV (1,200–2,000 g); 30 mg/kg/24 hr divided q 12 hr IV (> 2,000 g)
  • Neonates (postnatal age > 7 days): 15 mg/kg/24 hr divided q 24 hr IV (< 1,200 g); 15 mg/kg/24 hr divided q 8-12 hr IV (1,200–2,000 g); 45 mg/kg/24 hr divided q 8 hr IV (> 2,000 g)
  • Children: 45-60 mg/kg/24 hr divided q 8-12 hr IV
  • C. difficile–associated colitis: 40-50 mg/kg/24 hr divided q 6-8 hr PO; 40-50 mg/kg/24 hr divided q 6-8 hr PO
  • Ototoxicity
  • Nephrotoxicity
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