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Does Metformin Hydrochloride Extended Release Tablets Interact with Topiramate?

Metformin Hydrochloride Extended Release Tablets and Topiramate have a major drug interaction according to U.S. FDA drug labeling data. Carbonic anhydrase inhibitor that decreases serum bicarbonate and may increase risk for lactic acidosis when used with metformin. The mechanism involves induces non-anion gap, hyperchloremic metabolic acidosis. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.

Severity
Major
Topiramate Class
Cytochrome P450 3A4 Inducers
Management
Close medical supervision required
Data Source
U.S. FDA via OpenFDA

How This Interaction Works

The interaction between Metformin Hydrochloride Extended Release Tablets and Topiramate occurs because induces non-anion gap, hyperchloremic metabolic acidosis. Clinically, this means carbonic anhydrase inhibitor that decreases serum bicarbonate and may increase risk for lactic acidosis when used with metformin. This is classified as a major interaction, meaning it could cause serious harm if not properly managed. Your healthcare provider may need to adjust dosages, substitute one medication, or increase monitoring frequency.

What To Tell Your Doctor or Pharmacist

If you are taking Metformin Hydrochloride Extended Release Tablets and your doctor is considering prescribing Topiramate (or vice versa), make sure to:

  • Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
  • Ask whether the benefits of combining these medications outweigh the risks for your specific situation
  • Ask what symptoms to watch for that would indicate the interaction is causing problems
  • Ask how frequently you should be monitored while these are co-prescribed
  • Ask whether any dosage adjustments are needed
  • Never stop or change either medication without first consulting your healthcare provider
💊 Metformin Hydrochloride Extended Release Tablets(Metformin Hydrochloride)+💊 Topiramate(Topiramate)

Severity & Interaction Details

⚠️
major
Use with caution — major interaction
Serious risk of clinically significant harm. Generally avoid; if used, monitor closely.
Severity scale
MinorContra
On record
Yes
Drug A class
—
Drug B class
Cytochrome P450 3A4 Inducers
Source
NLP:metformin hydrochloride extended-release tablets

What this means in plain English

Carbonic anhydrase inhibitor that decreases serum bicarbonate and may increase risk for lactic acidosis when used with metformin.

What the FDA label says

"Induces non-anion gap, hyperchloremic metabolic acidosis"

📖 Source: NLP:metformin hydrochloride extended-release tablets

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Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine. For informational purposes only. Always consult your pharmacist or physician.