Drug interactions
Amiloride + Hydrochlorothiazide-losartan
Severity: Major
Amiloride and Hydrochlorothiazide-losartan: 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
Losartan and amiloride both raise serum potassium, and the potassium-lowering effect of hydrochlorothiazide only partly offsets this. Hyperkalemia can occur, especially in patients with renal impairment, diabetes or older age.
What this interaction means in plain words
Amiloride and Hydrochlorothiazide-losartan 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.
Amiloride belongs to Cardiovascular; Hydrochlorothiazide-losartan belongs to Cardiovascular.
Why it happens
Angiotensin receptor blockade reduces aldosterone-mediated potassium excretion while amiloride blocks the epithelial sodium channel, additively causing potassium retention.
What to do
Check serum potassium and creatinine within the first week or so and periodically thereafter. Avoid potassium supplements and salt substitutes, and stop amiloride if potassium becomes elevated.
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 Amiloride and Hydrochlorothiazide-losartan, 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-losartan
- Aliskiren + Hydrochlorothiazide-losartan Contraindicated
- Dofetilide + Hydrochlorothiazide-losartan Contraindicated
- Hydrochlorothiazide-losartan + Sparsentan Contraindicated
- Aceclofenac + Hydrochlorothiazide-losartan Major
- Aldesleukin + Hydrochlorothiazide-losartan Major
- Amifostine + Hydrochlorothiazide-losartan Major
Other interactions of Amiloride
- Amiloride + Eplerenone Contraindicated
- Amiloride + Spironolactone Contraindicated
- Amiloride + Triamterene Contraindicated
- Aceclofenac + Amiloride Major
- Acemetacin + Amiloride Major
- Amiloride + Amlodipine-benazepril Major
Frequently asked questions
Can I take Amiloride with Hydrochlorothiazide-losartan?
MediHelp rates the interaction as major. Amiloride and Hydrochlorothiazide-losartan 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. Losartan and amiloride both raise serum potassium, and the potassium-lowering effect of hydrochlorothiazide only partly offsets this. Hyperkalemia can occur, especially in patients with renal impairment, diabetes or older age.
How serious is the interaction between Amiloride and Hydrochlorothiazide-losartan?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check serum potassium and creatinine within the first week or so and periodically thereafter. Avoid potassium supplements and salt substitutes, and stop amiloride if potassium becomes elevated.
What other medicines interact with Hydrochlorothiazide-losartan?
MediHelp also lists interactions of Hydrochlorothiazide-losartan with, for example, Aliskiren, Dofetilide, Sparsentan. The full list is on the Hydrochlorothiazide-losartan 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.
