Cited by 126Diabetes Treatment and ManagementAnalytical Methods in PharmaceuticalsPharmacogenetics and Drug Metabolism

Novel Assay of Metformin Levels in Patients With Type 2 Diabetes and Varying Levels of Renal Function

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Frid, Anders, Sterner, Gunnar N., Löndahl, Magnus, Wiklander, Clara, Cato, Anne, Vinge, Ellen, Andersson, Anders·2010·Diabetes Care

Abstract

OBJECTIVE: To study trough levels of metformin in serum and its intra-individual variation in patients using a newly developed assay. RESEARCH DESIGN AND METHODS: Trough serum levels of metformin were measured once using liquid chromatography–tandem mass spectrometry (LCMSMS) in 137 type 2 diabetic patients with varying renal function (99 men) and followed repeatedly during 2 months in 20 patients (16 men) with estimated glomerular filtration rate (eGFR) <60 ml/min/1.73 m2 body surface. RESULTS: Patients with eGFR >60, 30–60, and <30 ml/min/1.73 m2 had median trough metformin concentrations of 4.5 μmol/l (range 0.1–20.7, n = 107), 7.71 μmol/l (0.12–15.15, n = 21), and 8.88 μmol/l (5.99–18.60, n = 9), respectively. The median intra-individual overall coefficient of variation was 29.4% (range 9.8–74.2). CONCLUSIONS: Determination of serum metformin with the LCMSMS technique is useful in patients on metformin treatment. Few patients had values >20 μmol/l. Metformin measurement is less suitable for dose titration.

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  • Above 30 ml/min/1.73 m2, metformin levels rarely go above 20 mmol/l, which seems to be a safe level.

    “Frid et al. supports these recommendations through findings that above 30 ml/min/1.73 m2 metformin levels rarely goes above 20 mmol/l, which seems to be a safe level [163].”

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Authors
Frid, A., Sterner, G. N., Löndahl, M., Wiklander, C., Cato, A., Vinge, E., & Andersson, A.
Affiliations
  • Department of Endocrinology, University Hospital MAS, Malmö, Sweden;
  • Department of Nephrology and Transplantation, Malmö University Hospital, Malmö, Sweden;
  • Skåne University Hospital (SE)
Corresponding author
Frid, Anders
Venue
Diabetes Care
Published
2010-03-09
Volume
33
Issue
6
Pages
1291-1293
ISSN
  • 0149-5992 (ISSN-L)
  • 1935-5548
OpenAlex
W2130429000
Cited by
126
References
8
Citations by year
2025: 1 · 2024: 11 · 2023: 4 · 2022: 7 · 2021: 9 · 2020: 8 · 2019: 9 · 2018: 11 · 2017: 11 · 2016: 12 · 2015: 9 · 2014: 9 · 2013: 9 · 2012: 10
FWCI
6.05
Type
journal article
Language
en
Open access
Locations
  • Diabetes Care (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Lund University Publications (Lund University) (submittedVersion)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
  • Physical Sciences › Chemistry › Analytical Chemistry › Analytical Methods in Pharmaceuticals
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
Keywords
metformin, type 2 diabetes, renal function, estimated glomerular filtration rate, liquid chromatography-tandem mass spectrometry, within-person variability, dose titration, pharmacokinetics
MeSH terms
Adult, Aged, Aged, 80 and over, Biological Assay, Chromatography, High Pressure Liquid, Diabetes Mellitus, Type 2, Female, Glomerular Filtration Rate, Humans, Hypoglycemic Agents, Kidney Function Tests, Male, Metformin, Middle Aged, Mass Spectrometry

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