Drug interactions
Efavirenz + Glimepiride-pioglitazone
Severity: Minor
Efavirenz and Glimepiride-pioglitazone: 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
Efavirenz induces CYP3A4 and may lower pioglitazone concentrations, possibly reducing its glucose-lowering effect. The effect is likely small because CYP2C8 is the main pathway for pioglitazone.
What this interaction means in plain words
Efavirenz and Glimepiride-pioglitazone have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Efavirenz belongs to Anti Virals; Glimepiride-pioglitazone belongs to Endocrine.
Why it happens
Induction of CYP3A4 (and possibly CYP2B6/2C enzymes) by efavirenz increasing pioglitazone metabolism.
What to do
Monitor glycemic control (blood glucose and HbA1c) after starting or stopping efavirenz and adjust the pioglitazone dose if control changes.
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
Other interactions of Efavirenz
- Cobimetinib + Efavirenz Contraindicated
- Dienogest / estradiol valerate + Efavirenz Contraindicated
- Dihydroergotamine intranasal + Efavirenz Contraindicated
- Dihydroergotamine + Efavirenz Contraindicated
- Doravirine + Efavirenz Contraindicated
- Efavirenz + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Efavirenz with Glimepiride-pioglitazone?
MediHelp rates the interaction as minor. Efavirenz and Glimepiride-pioglitazone have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Efavirenz induces CYP3A4 and may lower pioglitazone concentrations, possibly reducing its glucose-lowering effect. The effect is likely small because CYP2C8 is the main pathway for pioglitazone.
How serious is the interaction between Efavirenz and Glimepiride-pioglitazone?
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 glycemic control (blood glucose and HbA1c) after starting or stopping efavirenz and adjust the pioglitazone dose if control changes.
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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