Ampicillin

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General

  • Type: Penicillin
  • Dosage Forms: capsule, oral suspension, powder for injection
  • Dosage Strengths: capsule: 250, 500mg; oral suspension: 125, 250mg/5mL; powder for injection: 125mg, 250mg, 500mg, 1g, 2g, 10g
  • Routes of Administration: PO, IV, IM
  • Common Trade Names: Ampi, Omnipen, Penglobe, Principen

Adult Dosing

Pediatric Dosing

Pneumonia (peds)

  • 150-200mg/kg/day IV divided Q6hours (max dose: 4g per day)

Special Populations

  • Pregnancy:
  • Lactation:
  • Renal Dosing
    • Adult
    • Pediatric
  • Hepatic Dosing
    • Adult
    • Pediatric

Contraindications

  • Allergy to class/drug

Adverse Reactions

Serious

Common

Pharmacology

  • Half-life: 1-1.8 hr (normal renal function); 7-20 hr (anuria/ESRD)
  • Metabolism: Hepatic
  • Excretion: Urine
  • Mechanism of Action: Bactericidal; inhibits bacterial cell wall synthesis

Antibiotic Sensitivities[1]

Group Organism Sensitivity
Gram Positive Strep. Group A, B, C, G S
Strep. Pneumoniae S
Viridans strep I
Strep. anginosus gp S
Enterococcus faecalis S
Enterococcus faecium I
MSSA R
MRSA R
CA-MRSA R
Staph. Epidermidis R
C. jeikeium R
L. monocytogenes S
Gram Negatives N. gonorrhoeae R
N. meningitidis S
Moraxella catarrhalis R
H. influenzae I
E. coli I
Klebsiella sp R
E. coli/Klebsiella ESBL+ R
E coli/Klebsiella KPC+ R
Enterobacter sp, AmpC neg R
Enterobacter sp, AmpC pos R
Serratia sp R
Serratia marcescens X1
Salmonella sp I
Shigella sp I
Proteus mirabilis S
Proteus vulgaris R
Providencia sp. R
Morganella sp. R
Citrobacter freundii R
Citrobacter diversus R
Citrobacter sp. R
Aeromonas sp R
Acinetobacter sp. R
Pseudomonas aeruginosa R
Burkholderia cepacia R
Stenotrophomonas maltophilia R
Yersinia enterocolitica R
Francisella tularensis X1
Brucella sp. X1
Legionella sp. R
Pasteurella multocida S
Haemophilus ducreyi R
Vibrio vulnificus X1
Misc Chlamydophila sp R
Mycoplasm pneumoniae R
Rickettsia sp X1
Mycobacterium avium X1
Anaerobes Actinomyces S
Bacteroides fragilis R
Prevotella melaninogenica S
Clostridium difficile X1
Clostridium (not difficile) S
Fusobacterium necrophorum S
Peptostreptococcus sp. S

Key

  • S susceptible/sensitive (usually)
  • I intermediate (variably susceptible/resistant)
  • R resistant (or not effective clinically)
  • S+ synergistic with cell wall antibiotics
  • U sensitive for UTI only (non systemic infection)
  • X1 no data
  • X2 active in vitro, but not used clinically
  • X3 active in vitro, but not clinically effective for Group A strep pharyngitis or infections due to E. faecalis
  • X4 active in vitro, but not clinically effective for strep pneumonia

See Also

References

  1. Sanford Guide to Antimicrobial Therapy 2014