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Does Tiagabine Hydrochloride Interact with Valproate?

Tiagabine Hydrochloride and Valproate have a moderate drug interaction according to U.S. FDA drug labeling data. Tiagabine causes slight decrease (about 10%) in steady-state valproate concentrations. Valproate significantly decreases tiagabine binding in vitro, resulting in approximately 40% increase in free tiagabine concentration. The mechanism involves valproate decreases tiagabine protein binding. 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
Moderate
Management
Monitor for effects
Data Source
U.S. FDA via OpenFDA

How This Interaction Works

The interaction between Tiagabine Hydrochloride and Valproate occurs because valproate decreases tiagabine protein binding. Clinically, this means tiagabine causes slight decrease (about 10%) in steady-state valproate concentrations. valproate significantly decreases tiagabine binding in vitro, resulting in approximately 40% increase in free tiagabine concentration. This is classified as a moderate interaction. While it may not require stopping either medication, your healthcare provider should be aware you are taking both so they can monitor for potential effects and adjust treatment if necessary.

What To Tell Your Doctor or Pharmacist

If you are taking Tiagabine Hydrochloride and your doctor is considering prescribing Valproate (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 whether any dosage adjustments are needed
  • Never stop or change either medication without first consulting your healthcare provider
💊 Tiagabine Hydrochloride(Tiagabine Hydrochloride)+💊 Valproate

Severity & Interaction Details

🟡
moderate
Be aware — moderate interaction
Documented interaction with manageable risk. May require dose adjustment or monitoring.
Severity scale
MinorContra
On record
Yes
Drug A class
—
Drug B class
—
Source
NLP:tiagabine hydrochloride

What this means in plain English

Tiagabine causes slight decrease (about 10%) in steady-state valproate concentrations. Valproate significantly decreases tiagabine binding in vitro, resulting in approximately 40% increase in free tiagabine concentration.

What the FDA label says

"Valproate decreases tiagabine protein binding"

📖 Source: NLP:tiagabine hydrochloride

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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.