Probably what you see is the tablet shells. For sustained release formulation, it is common that you may notice empty capsule/tablet shells in feces. These shells are made of insoluble polymers which helps in controlling the release of active ingredient (Metformin). You may discuss this with your physician on next visit.
Sustained release does not have to be a capsule. The tablets are coated with a film that delays release. This can show up in the stool, even tho the meds have been absorbed.
- Metformin Information for Consumers
- Metformin Information for Healthcare Professionals (includes dosage details)
- Side Effects of Metformin (detailed)
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