Drug interactions
Chlorothiazide + Hydrochlorothiazide-lisinopril
Severity: Major
Chlorothiazide and Hydrochlorothiazide-lisinopril: major 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
Chlorothiazide duplicates the thiazide component already present and increases the risk of hypokalemia, hyponatremia, hypotension and renal impairment without added benefit.
What this interaction means in plain words
Chlorothiazide and Hydrochlorothiazide-lisinopril can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Chlorothiazide belongs to Cardiovascular; Hydrochlorothiazide-lisinopril belongs to Cardiovascular.
Why it happens
Duplicate inhibition of the distal tubule sodium-chloride cotransporter with additive electrolyte loss and volume depletion.
What to do
Avoid combining two thiazides and discontinue one. Monitor electrolytes and renal function if overlap is unavoidable.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Chlorothiazide and Hydrochlorothiazide-lisinopril, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Hydrochlorothiazide-lisinopril
- Dofetilide + Hydrochlorothiazide-lisinopril Contraindicated
- Hydrochlorothiazide-lisinopril + Sacubitril / valsartan Contraindicated
- Amifostine + Hydrochlorothiazide-lisinopril Major
- Amiloride + Hydrochlorothiazide-lisinopril Major
- Benazepril + Hydrochlorothiazide-lisinopril Major
- Bendroflumethiazide + Hydrochlorothiazide-lisinopril Major
Other interactions of Chlorothiazide
Frequently asked questions
Can I take Chlorothiazide with Hydrochlorothiazide-lisinopril?
MediHelp rates the interaction as major. Chlorothiazide and Hydrochlorothiazide-lisinopril can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Chlorothiazide duplicates the thiazide component already present and increases the risk of hypokalemia, hyponatremia, hypotension and renal impairment without added benefit.
How serious is the interaction between Chlorothiazide and Hydrochlorothiazide-lisinopril?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining two thiazides and discontinue one. Monitor electrolytes and renal function if overlap is unavoidable.
What other medicines interact with Hydrochlorothiazide-lisinopril?
MediHelp also lists interactions of Hydrochlorothiazide-lisinopril with, for example, Dofetilide, Sacubitril / valsartan, Amifostine. The full list is on the Hydrochlorothiazide-lisinopril page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
