Abstract
Purpose
Gastro-esophageal reflux disease is common in patients with type 2 diabetes. A common treatment is the co-administration of proton-pump inhibitors (PPIs) and metformin. To date, however, the effects of co-administration of PPIs, which inhibit organic cation transporter (OCT) activity, on the action of metformin (a well-known substrate of OCTs) have not been clearly demonstrated.
Methods
This was a randomized, double-blind, two-way crossover, placebo-controlled trial. Healthy male volunteers (n = 20) received metformin (single dose 1,000 mg on day 1 and single dose 750 mg on day 2, with a 12-h interval) co-administered with placebo or with lansoprazole (30 mg). Plasma concentrations of metformin were measured up to 24 h after the second dose. The glucose-lowering effects of metformin were evaluated by the oral glucose tolerance test before and after each single dose of metformin within the 2-day period.
Results
Lansoprazole increased the mean metformin maximum plasma concentration and area under the plasma concentration–time curve from zero to 24 h after the second dosing by 15 and 17 %, respectively (P < 0.05). Moreover, lansoprazole prolonged the metformin elimination half-life from 3.9 to 4.5 h and decreased its renal clearance by 13 % (P < 0.05). However, lansoprazole had no effect on the maximum glucose level and the area under the serum glucose concentration–time curve of metformin.
Conclusions
Collectively, we found a modest pharmacokinetic drug interaction between lansoprazole and metformin, which suggests that the concomitant use of these drugs should be appropriately monitored. Further studies are warranted to assess changes in metformin pharmacokinetics in patients with diabetes receiving long-term lansoprazole therapy.
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Acknowledgments
This work was supported by a grant from the Key Technologies for New Drug Innovation and Development of China (No. 2011ZXJ09202-13; No. 2012BAK25B00) and the National Natural Science Foundation of China (No.81373947; No.81201985). We thank members of the nursing and research staff who participated in the clinical studies.
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Ding, Y., Jia, Y., Song, Y. et al. The effect of lansoprazole, an OCT inhibitor, on metformin pharmacokinetics in healthy subjects. Eur J Clin Pharmacol 70, 141–146 (2014). https://doi.org/10.1007/s00228-013-1604-7
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DOI: https://doi.org/10.1007/s00228-013-1604-7