Intravenous ampicillin pharmacokinetics in the third trimester of pregnancy

Ther Drug Monit. 1983;5(1):55-60. doi: 10.1097/00007691-198303000-00003.


The pharmacokinetics of a single dose of intravenous ampicillin were studied in nine patients during their third trimester of pregnancy. Each volunteer was given either 500 mg (5.7-8.8 mg/kg) or 1 g (15.4-21.4 mg/kg) of sodium ampicillin by rapid infusion. Postinfusion plasma concentration-time curves followed biexponential decay in all subjects. Calculated parameters included a mean plasma distribution volume of 177.1 +/- 97.5 ml/kg, tissue or peripheral distribution volume of 246.2 +/- 143.9 ml/kg, elimination half-life of 1.60 +/- 0.51 h, and total body clearance of 4.59 +/- 1.48 ml/min/kg. Dose-dependent disposition was not observed. Gestation-specific drug therapy research during pregnancy is discussed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Ampicillin / metabolism*
  • Female
  • Humans
  • Infusions, Parenteral
  • Kinetics
  • Pregnancy Trimester, Third
  • Pregnancy*
  • Renal Circulation


  • Ampicillin