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Antimicrobials
Penicillin G, 5 million units IV initial dose, then 2.5 million units IV every 4 hours until delivery
An adequate duration of IAP is defined as antibiotic given greater than or equal to 4 hours before delivery.
Penicillin has a narrower spectrum of antimicrobial activity and therefore might be less likely to select for resistant organisms than ampicillin.
