Optimizing PreTerm Infant Ampicillin Dosing

OPTI-Amp is a prospective, open-label, non-randomized pharmacokinetic and safety trial of short-course ampicillin administered to preterm neonates in the Neonatal Intensive Care Unit (NICU) at Duke. The objectives of the study are to 1) evaluate whether short-course ampicillin provides therapeutic exposures for 48 hours from ampicillin initiation for preterm neonates undergoing evaluation of early onset sepsis (EOS) and 2) evaluate the safety of short-course ampicillin compared to standard empiric ampicillin. The prescribing of drugs to infants will not be part of this protocol. Approximately 60 neonates ≤34 weeks gestational age and \<7 days postnatal age at the time of screening, who are receiving empiric ampicillin prescribed per standard of care (SOC) by their treating provider will be enrolled in the study. Participants will be in the study up to 30 days or hospital discharge, whichever is sooner. Enrolled infants who receive short-course ampicillin will have a pharmacokinetic sample collected at 48 (+/-2) hours from the time that ampicillin was initiated. Additional opportunistic pharmacokinetic (PK) samples can be collected between the final ampicillin dose (time of enrollment) and 72 hours from ampicillin initiation if the patient is receiving other SOC labs; however, these are not required. Demographic information, clinical data, and biospecimen information (including date and time of sample collection) will also be collected for enrolled participants. All enrolled infants will be in the safety population. Those with at least one PK sample will be included in the PK population. In addition to the risks of blood drawing and loss of confidentiality, there may be a risk of under treatment of EOS if clinical cultures result positive after ampicillin discontinuation and therapeutic exposure is not maintained between 24 or 36 hours until 48 hours. Participants that fall under the latter situation will either not be enrolled in the study or will be withdrawn as determined by the study PI.