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[A method to quantify diazepam with high resolution liquid chromatography in patients undergoing multiple therapy]
A Domínguez1, H C Cárdenas, M C Galindo
1UAM-Xochimilco.
Summary
This study presents a rapid, sensitive, and specific HPLC method for monitoring diazepam levels in patients undergoing multiple therapies. The method accurately quantifies diazepam, aiding in therapeutic drug monitoring and identifying potential drug interactions.
Area of Science:
- Analytical Chemistry
- Pharmacology
Context:
- Monitoring therapeutic drug levels is crucial for optimizing patient outcomes, especially in polypharmacy.
- Existing methods for diazepam quantification may lack the sensitivity or specificity required for complex patient populations.
Purpose:
- To develop and validate a rapid, sensitive, and specific high-performance liquid chromatography (HPLC) method for quantifying diazepam in human plasma.
- To assess the method's utility in therapeutic drug monitoring for patients receiving multiple medications.
Summary:
- A novel HPLC method using a Novapak C18 column with hexane extraction and borate buffer was developed for diazepam quantification.
- The method demonstrated a low limit of detection (~30 ng/mL), acceptable analytical recovery (~70%), and good precision (within-day and between-day variations <11%).
- Application in clinical settings revealed therapeutic diazepam concentrations in most patients, with one case showing undetectable levels possibly due to magnesium hydroxide interaction, highlighting reduced absorption.
Impact:
- Provides a reliable analytical tool for clinicians to monitor diazepam therapy, ensuring efficacy and safety.
- Facilitates the identification of pharmacokinetic interactions, such as reduced diazepam absorption with antacids.
- Contributes to personalized medicine by enabling precise therapeutic drug level management in psychiatric patients.