For patients with type 2 diabetes, metformin is the most often recommended drug. However, there are substantial individual differences in the pharmacological response to metformin. To investigate the effect of transporter polymorphisms on metformin pharmacokinetics in an environment free of confounding variables, we
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For patients with type 2 diabetes, metformin is the most often recommended drug. However, there are substantial individual differences in the pharmacological response to metformin. To investigate the effect of transporter polymorphisms on metformin pharmacokinetics in an environment free of confounding variables, we conducted our study on healthy participants. This is the first investigation to consider demographic characteristics alongside all transporters involved in metformin distribution. Pharmacokinetic parameters of metformin were found to be affected by age, sex, ethnicity, and several polymorphisms. Age and
SLC22A4 and
SLC47A2 polymorphisms affected the area under the concentration-time curve (AUC). However, after adjusting for dose-to-weight ratio (dW), sex, age, and ethnicity, along with
SLC22A3 and
SLC22A4, influenced AUC. The maximum concentration was affected by age and
SLC22A1, but after adjusting for dW, it was affected by sex, age, ethnicity,
ABCG2, and
SLC22A4. The time to reach the maximum concentration was influenced by sex, like half-life, which was also affected by
SLC22A3. The volume of distribution and clearance was affected by sex, age, ethnicity and
SLC22A3. Alternatively, the pharmacokinetics of metformin was unaffected by polymorphisms in
ABCB1,
SLC2A2,
SLC22A2, or
SLC47A1. Therefore, our study demonstrates that a multifactorial approach to all patient characteristics is necessary for better individualization.
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