The effect of pre-dosing with metformin on the insulin response to oral sugar in insulin-dysregulated horses.
Authors: Colmer Sarah F, Adams Amanda A, Adam Emma, Miller Rachel, Stefanovski Darko, Kulp Jeaneen C, van Eps Andrew
Journal: Equine veterinary journal
Summary
# Editorial Summary: Metformin Pre-dosing and Insulin Response in Dysregulated Horses Hyperinsulinaemia following feeding presents a significant management challenge in horses with insulin dysregulation, particularly those predisposed to laminitis, and pharmacological interventions that could blunt post-prandial insulin spikes warrant investigation. Colmer and colleagues administered metformin one hour before an oral glucose challenge in horses with experimentally-induced insulin dysregulation, measuring subsequent insulinaemic responses to determine whether pre-dosing could effectively reduce peak insulin concentrations. The treatment protocol successfully dampened insulin responses to the oral sugar load, suggesting that timed metformin administration prior to meals could provide a practical strategy for managing dysregulated horses in clinical settings. For equine professionals managing insulin-dysregulated or high-risk animals, this finding indicates that metformin's glycaemic-lowering effects may be optimised through strategic pre-feeding dosing rather than concurrent administration with feeds. Whilst the study utilised experimentally-induced dysregulation rather than naturally-occurring disease, the results support further investigation into dosing protocols that could help practitioners mitigate laminitis risk in susceptible populations.
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Practical Takeaways
- •Pre-treatment with metformin before feeding may reduce problematic insulin spikes in ID-affected horses, offering a practical timing strategy for practitioners
- •This approach could help manage laminitis risk in insulin-dysregulated horses by mitigating post-meal hyperinsulinaemia without requiring continuous medication
- •Consider discussing timed metformin dosing with veterinarians as a targeted intervention for horses with confirmed insulin dysregulation experiencing recurrent or persistent laminitis
Key Findings
- •Single-dose metformin administered 1 hour prior to oral glucose challenge reduced insulinaemic responses in horses with experimentally-induced insulin dysregulation
- •Pre-dosing strategy may be applicable to naturally-occurring insulin dysregulation in horses
- •Targeted metformin administration could help control post-prandial hyperinsulinaemia