Drug interactions
Chlorthalidone + Glipizide
Severity: Moderate
Chlorthalidone and Glipizide: moderate 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
Chlorthalidone can raise blood glucose and so reduce the effect of glipizide, particularly at higher doses. Glycemic control may worsen in diabetic patients. Hypokalemia from the diuretic may further impair insulin release.
What this interaction means in plain words
Chlorthalidone and Glipizide can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Chlorthalidone belongs to Cardiovascular; Glipizide belongs to Endocrine.
Why it happens
Thiazide-induced hypokalemia and reduced insulin secretion and sensitivity oppose the hypoglycemic effect.
What to do
Monitor blood glucose and HbA1c after starting or changing chlorthalidone and adjust the glipizide dose if needed. Keep potassium in the normal range.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Chlorthalidone
Other interactions of Glipizide
Frequently asked questions
Can I take Chlorthalidone with Glipizide?
MediHelp rates the interaction as moderate. Chlorthalidone and Glipizide can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Chlorthalidone can raise blood glucose and so reduce the effect of glipizide, particularly at higher doses. Glycemic control may worsen in diabetic patients. Hypokalemia from the diuretic may further impair insulin release.
How serious is the interaction between Chlorthalidone and Glipizide?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood glucose and HbA1c after starting or changing chlorthalidone and adjust the glipizide dose if needed. Keep potassium in the normal range.
What other medicines interact with Chlorthalidone?
MediHelp also lists interactions of Chlorthalidone with, for example, Amifostine, Atenolol-chlorthalidone, Candesartan-hydrochlorothiazide. The full list is on the Chlorthalidone page.
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