Drug interactions
Chlorthalidone + Insulin lispro
Severity: Moderate
Chlorthalidone and Insulin lispro: 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 impair glucose tolerance and raise blood glucose, so insulin requirements may increase. The effect is usually modest but can worsen glycemic control. Hypokalemia may contribute.
What this interaction means in plain words
Chlorthalidone and Insulin lispro 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; Insulin lispro belongs to Endocrine.
Why it happens
Thiazides reduce insulin secretion and peripheral insulin sensitivity, partly through hypokalemia, opposing insulin action.
What to do
Monitor blood glucose more closely when starting or adjusting chlorthalidone and titrate the insulin dose as needed. Correct potassium deficits.
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 Insulin lispro
Frequently asked questions
Can I take Chlorthalidone with Insulin lispro?
MediHelp rates the interaction as moderate. Chlorthalidone and Insulin lispro 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 impair glucose tolerance and raise blood glucose, so insulin requirements may increase. The effect is usually modest but can worsen glycemic control. Hypokalemia may contribute.
How serious is the interaction between Chlorthalidone and Insulin lispro?
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 more closely when starting or adjusting chlorthalidone and titrate the insulin dose as needed. Correct potassium deficits.
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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