Can I use Metformin past the expiration date?

Download Free Worksheet

Can I use Metformin past the expiration date?

You can use Metformin if it has recently expired. The process of drug degradation does not start right away and the drug will probably work with its full potency after 3-6 months of the expiration date. 

However, I would not recommend taking Metformin if it expired a year or more ago. This is because expired Metformin starts to lose its potency over time and there’s no way to tell how much potency has already been lost. 

There is no purpose in taking a med that doesn’t do much to achieve the therapeutic response you’re hoping for. This is exactly why the Food and Drug Administration (FDA) has recommended staying away from expired meds as it’s too big a risk to take (1). 

What are the dangers associated with the use of expired Metformin?

If you are using expired Metformin, you will not be able to achieve your desired therapeutic outcome. Metformin is a prescription drug that is commonly used for the management of diabetes. 

If you continue to take the expired med, it will not control your blood glucose levels effectively. This can give rise to diabetes-related health complications. So, make sure you take adequately potent Metformin and in the right way to make the most out of it.

It is also important to make sure that you do not crush or cut extended-release metformin tablets.

What to do if you have taken expired Metformin?

A single dose of expired Metformin will not harm you. The drug may still work if it has recently expired. However, this is a big risk to take, especially if you have uncontrolled type-II diabetes. 

This is why it is best not to take expired Metformin and ask your pharmacist for a new batch of Metformin tablets. If you are using it for diabetes, you should never miss your dose. 

Was this helpful?

Thanks for your feedback!



U.S. Food and Drug Administration. Don’t Be Tempted to Use Expired Medicines [Internet]. Silver Spring (MD): U.S. Food and Drug Administration; 2021 [cited 2022 Oct 18]. Available from: