SugarMD - Why So Many People Quit Metformin

Short Summary

Main recommendation: Do not stop metformin abruptly without a plan; instead, close the underlying metabolic gap first and consider dihydroberberine, a more bioavailable form of berberine, as an alternative or add-on when metformin is poorly tolerated. The speaker, Dr. Ahmed Urggon, argues that many people quit metformin because of GI symptoms, fatigue, and B12 depletion, but stopping it suddenly can cause the liver to rebound on glucose output and unmask insulin resistance.

Key Points

• Many patients stop metformin because of chronic bloating, diarrhea, fatigue, brain fog, poor exercise tolerance, and low B12, which the speaker says are common but often dismissed.
• Dr. Ergin says metformin lowers liver glucose output and mildly improves insulin sensitivity via AMPK, but does not fix insulin resistance, restore metabolic flexibility, or heal the pancreas.
• Dr. Ergin notes that long-term metformin use is associated with vitamin B12 deficiency, which he says can contribute to neuropathy, fatigue, cognitive issues, and anemia-like symptoms.
• Dr. Ergin explains that abruptly stopping metformin typically causes hepatic glucose output to rebound, especially overnight, so fasting glucose often rises first, with insulin then rising to compensate — though he notes this doesn't happen to everybody, especially if other medications or lifestyle changes offset it.
• Dr. Ergin says traditional berberine has poor absorption, so many cheap products may never reach therapeutic blood levels, which may explain inconsistent results; he presents dihydroberberine as more bioavailable and better tolerated.

Details Worth Noting

• Concrete instructions:
  • Do not stop metformin suddenly without a plan, because the body does not recalibrate gradually and the liver can rebound.
  • Stopping makes more sense when insulin resistance has improved significantly through diet, weight loss, improved muscle mass, and other metabolic interventions, or when side effects outweigh benefits.
  • If metformin is poorly tolerated, dihydroberberine can be considered as an alternative, or as an add-on that may allow a lower metformin dose, with the speaker noting lower doses can reach higher blood levels with fewer GI effects.
  • Check what actually happens to glucose numbers during any change rather than assuming the result, and address the underlying diet and insulin resistance rather than relying on a pill alone.
• The speaker notes that the rebound effect is not withdrawal but exposure: the medication was covering a metabolic problem that was never fully corrected.
• Mitochondrial effects: Dr. Ergin explains that metformin partially inhibits mitochondrial respiration, which he says may explain low energy or reduced exercise capacity in some patients.
• The speaker explicitly states that neither metformin nor berberine fixes diabetes, and that a high-carbohydrate, inflammatory diet will undermine any supplement or medication.

Bottom Line

Stopping metformin is less about the drug itself and more about whether the underlying insulin resistance has been corrected, so any switch should be planned and monitored rather than done abruptly.