Drug interactions
Chlorothiazide + Insulin lispro
Severity: Minor
Chlorothiazide and Insulin lispro: 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
Thiazide diuretics such as chlorothiazide can raise blood glucose and blunt the effect of insulin, mostly at higher doses. Insulin requirements may rise.
What this interaction means in plain words
Chlorothiazide and Insulin lispro have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Chlorothiazide belongs to Cardiovascular; Insulin lispro belongs to Endocrine.
Why it happens
Thiazides impair insulin secretion and sensitivity, partly through potassium depletion, opposing insulin action.
What to do
Monitor blood glucose and potassium when chlorothiazide is started or the dose increased. Raise the insulin dose if hyperglycemia develops.
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 Insulin lispro
Other interactions of Chlorothiazide
Frequently asked questions
Can I take Chlorothiazide with Insulin lispro?
MediHelp rates the interaction as minor. Chlorothiazide and Insulin lispro have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Thiazide diuretics such as chlorothiazide can raise blood glucose and blunt the effect of insulin, mostly at higher doses. Insulin requirements may rise.
How serious is the interaction between Chlorothiazide and Insulin lispro?
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 blood glucose and potassium when chlorothiazide is started or the dose increased. Raise the insulin dose if hyperglycemia develops.
What other medicines interact with Insulin lispro?
MediHelp also lists interactions of Insulin lispro with, for example, Alogliptin-pioglitazone, Ethanol, Metreleptin. The full list is on the Insulin lispro page.
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