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Note: Dosage expressed as combined ampicillin and cloxacillin Neonates: I.M., I.V.: 75 mg (1 neonatal vial) every 8 hours Oral: 90 mg every 4 hours Infants and Children <2 years: I.M., I.V.: 125-250 mg every 4-6 hours Oral: 250 mg every 6 hours Children 2-10 years: I.M., I.V.: 250-500 mg every 4-6 hours Oral: 250-500 mg every 6 hours Children >10 years and Adults: I.M., I.V.: 500-1000 mg every 4-6 hours Oral: 500-1000 mg every 6 hours Product Availability Product available in various countries; not currently available in the U.S. Dosage Forms Capsule: 500 mg [contains ampicillin 250 mg and cloxacillin 250 mg] Injection, powder for reconstitution, neonatal: 75 mg [contains ampicillin 50 mg and cloxacillin 25 mg] Injection, powder for reconstitution: 500 mg [contains ampicillin 250 mg and cloxacillin 250 mg] Powder for neonatal drops: 90 mg/0.6 mL (8 mL) [contains ampicillin 60 mg and cloxacillin 30 mg; sodium benzoate; packaged with pipette] Powder for oral suspension: 250 mg/5 mL (100 mL) [contains ampicillin 125 mg and cloxacillin; sodium benzoate; fruit flavor] Use of UpToDate is subject to the Subscription and License Agreement . Topic 10457 Version 28.0 © 2013 UpToDate, Inc. All rights reserved. | Subscription and License Agreement | Release: 21.6- C21.56 Licensed to: AsanBook Dig. Med. Lib. | Support Tag: [1003-201.65.114.212-1237D62C13-S244013.14]