Continuous ampicillin infusion as an alternative to intermittent infusion for adult inpatients: a case series
Taku Ogawa1, Kei Kasahara1, Kazuro Ikawa2
1Center for Infectious Diseases, Nara Medical University, 840 Shijo, Kashihara, Nara 634-8522, Japan.
Abstract:
Intravenous ampicillin has been extensively used for various kinds of infections for more than fifty years. This drug is administered intermittently, which can result in missed or delayed drug administration and sleep interruption that can have a negative impact on the quality of life during hospitalization. Continuous infusion may solve these concerns. We reviewed the cases of five patients who were treated with continuous ampicillin infusions in our hospital. The ampicillin serum concentrations were from 11.3 to 32.8 μg/mL, which was above the ampicillin MICs of the causative organisms, ≤0.06 to 4 μg/mL. Although the dosages given of ampicillin varied in each case, the serum concentrations showed a strong correlation with creatinine clearance (r(2) = 0.91). All the patients improved at the time of discharge, or transfer to another hospital, with no significant complications during the continuous infusion. Continuous ampicillin infusion could be a better alternative for frequent intermittent infusion for adult inpatients with infections due to ampicillin-susceptible organisms.
Insights
Continuous ampicillin infusion offers a better alternative to intermittent dosing for hospitalized adults. This method improves drug delivery and patient quality of life, with effective serum concentrations achieved.
Area of Science:
- Pharmacology
- Infectious Diseases
- Clinical Pharmacy
Background:
- Intravenous ampicillin is a long-standing antibiotic treatment for diverse infections.
- Intermittent ampicillin administration can lead to dosing errors and sleep disruption.
- Continuous infusion presents a potential solution to these issues.
Purpose of the Study:
- To evaluate the efficacy and safety of continuous ampicillin infusion in adult inpatients.
- To assess ampicillin serum concentrations and their correlation with patient parameters.
Main Methods:
- Retrospective review of five adult patients receiving continuous ampicillin infusions.
- Measurement of ampicillin serum concentrations.
- Correlation analysis with creatinine clearance.
Main Results:
- Achieved ampicillin serum concentrations (11.3–32.8 μg/mL) exceeded minimum inhibitory concentrations (MICs) of susceptible organisms (≤0.06–4 μg/mL).
- A strong correlation was observed between ampicillin serum concentrations and creatinine clearance (r² = 0.91).
- All patients showed clinical improvement without significant complications.
Conclusions:
- Continuous ampicillin infusion is a viable and potentially superior alternative to intermittent dosing for adult inpatients.
- This method ensures therapeutic drug levels and enhances patient comfort and care quality.
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