Drug interactions
Glimepiride-pioglitazone + Phenobarbital
Severity: Minor
Glimepiride-pioglitazone and Phenobarbital: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Phenobarbital is an enzyme inducer and may lower pioglitazone concentrations, possibly reducing its glucose-lowering effect. It may also modestly reduce glimepiride exposure through CYP2C9 induction.
What this interaction means in plain words
Glimepiride-pioglitazone and Phenobarbital have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Induction of hepatic CYP enzymes (CYP2C8, CYP3A4, CYP2C9) increases metabolism of both antidiabetic drugs.
What to do
Monitor glucose control when phenobarbital is started, changed or stopped and adjust antidiabetic doses as required.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Glimepiride-pioglitazone
Frequently asked questions
Can I take Glimepiride-pioglitazone with Phenobarbital?
MediHelp rates the interaction as minor. Glimepiride-pioglitazone and Phenobarbital have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Phenobarbital is an enzyme inducer and may lower pioglitazone concentrations, possibly reducing its glucose-lowering effect. It may also modestly reduce glimepiride exposure through CYP2C9 induction.
How serious is the interaction between Glimepiride-pioglitazone and Phenobarbital?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor glucose control when phenobarbital is started, changed or stopped and adjust antidiabetic doses as required.
What other medicines interact with Glimepiride-pioglitazone?
MediHelp also lists interactions of Glimepiride-pioglitazone with, for example, Fluconazole, Gemfibrozil, Insulin aspart. The full list is on the Glimepiride-pioglitazone page.
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