Does the effectiveness of metformin decrease after its expiration date?

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Expired metformin has shown promising results as a corrosion inhibitor in acidic environments. A study demonstrated that expired metformin exhibited excellent performance in inhibiting corrosion in a simulated acidizing environment (15% HCl), with inhibition efficiency exceeding 92% at 60 °C (). The drug's effectiveness increased with rising temperature and the addition of KI. Potentiodynamic measurements revealed that metformin primarily acts as a cathodic-type inhibitor, mainly inhibiting the cathodic hydrogen evolution half-reaction.
Interestingly, while this study focuses on the repurposing of expired metformin for corrosion inhibition, other research has explored various applications of metformin beyond its primary use as an oral hypoglycemic agent. For instance, metformin has shown potential in reducing cardiovascular events, preventing stroke, and even possessing anti-cancer properties ( and ). This highlights the versatility of metformin and the importance of exploring alternative uses for expired medications.
In conclusion, the study on expired metformin as a corrosion inhibitor demonstrates a novel application for this widely used diabetes medication. Surface analysis techniques, including SEM/EDS, AFM, and FT-IR, provided evidence of metformin molecules adsorbing onto the steel surface, forming a protective film that shields against aggressive acid attack (). This research not only offers a potential solution for corrosion prevention but also emphasizes the importance of investigating alternative uses for expired pharmaceuticals, potentially reducing waste and finding new applications for these compounds.