Metformin, a common diabetes medication, can cause urine to develop a distinctive odor due to how the body metabolizes the drug. This effect varies by individual and dosage.
Metformin works primarily by reducing glucose production in the liver and improving insulin sensitivity. When metabolized, it produces metabolites that can alter urine odor. The most notable byproduct is dimethylbiguanide, which contributes to the smell.
Metformin comes in several formulations:
| Type | Release Time | Common Brands |
|---|---|---|
| Immediate-release | 6-8 hours | Glucophage |
| Extended-release | 10-12 hours | Glumetza, Fortamet |
| Long-acting | 24 hours | Ryomet |
Extended-release versions may prolong the odor effect due to slower absorption.
After starting metformin, a patient noticed their urine smelled faintly sweet and metallic. Their doctor confirmed this was normal and suggested drinking more water to dilute the odor. The smell decreased over time as their body adjusted to the medication.
While metformin-induced urine odor is harmless, persistent or foul-smelling urine could indicate an infection or other issue. If the smell becomes unusually strong or is accompanied by pain, consult a healthcare provider.