Hydrochlorothiazide and Losartan Interaction
Drug interaction information between Hydrochlorothiazide and Losartan.
Hydrochlorothiazide and Losartan have a documented minor interaction in FDA labeling.
FDA drug labeling documents a minor-severity interaction between Hydrochlorothiazide and Losartan. This page displays the available source-record category and label text. The category is not an individual risk estimate or medication-combination direction.
How They Interact
Both of these medicines can cause your body to hold onto too much potassium. Having high potassium levels can be dangerous for your heart and may lead to kidney problems.
FDA Label Information
The VA NEPHRON trial enrolled 1448 patients with type 2 diabetes, elevated urinary-albumin-to-creatinine ratio, and decreased estimated glomerular filtration rate (GFR 30 to 89.9 ml/min), randomized them to lisinopril or placebo on a background of losartan therapy and followed them for a median of 2.2 years. Patients receiving the combination of losartan and lisinopril did not obtain any additional benefit compared to monotherapy for the combined endpoint of decline in GFR, end state renal disease, or death, but experienced an increased incidence of hyperkalemia and acute kidney injury...
Hydrochlorothiazide Also Interacts With
- Hydrochlorothiazide major
- Aliskiren major
- Lisinopril minor
- Spironolactone minor
- Propranolol minor
Losartan Also Interacts With
- Aliskiren major
- Lithium moderate
- Fluconazole minor
- Glecaprevir/Pibrentasvir minor
- Hydrochlorothiazide minor
Frequently Asked Questions
What SPL severity band is on file for Hydrochlorothiazide/Triamterene + Losartan?
Compiled FDA labeling labels this pair minor. That is a source-record field, not an individual medication-combination decision.
Which drug in this pair has the larger labeled-interaction portfolio?
Hydrochlorothiazide has 13 labeled pairs on file vs Losartan's 10. In the minor band specifically: Hydrochlorothiazide has 11 (also Lisinopril, Spironolactone, Propranolol, Lithium); Losartan has 8 (also Fluconazole, Glecaprevir/Pibrentasvir, Hydrochlorothiazide, Hydrochlorothiazide).
What mechanism field is on file for Hydrochlorothiazide/Triamterene and Losartan?
Both of these medicines can cause your body to hold onto too much potassium. Having high potassium levels can be dangerous for your heart and may lead to kidney problems.
Hydrochlorothiazide carries more major-labeled pairs than Losartan
SPL source-record counts only. This page's band is minor · classes on file: Hydrochlorothiazide (Thiazide / Potassium-Sparing Diuretic Combination); Losartan (Angiotensin II Receptor Blocker (ARB)).
Hydrochlorothiazide has 2 major-labeled pairs vs Losartan's 1. This page itself is in the minor band, not the major band.
2 major · 0 moderate · 11 minor · 13 total
- Other minor peers for Hydrochlorothiazide
- Lisinopril
- Spironolactone
- Propranolol
- Lithium
1 major · 1 moderate · 8 minor · 10 total
- Other minor peers for Losartan
- Fluconazole
- Glecaprevir/Pibrentasvir
- Hydrochlorothiazide
- Hydrochlorothiazide
Sources: FDA Drug Labels (SPL) via openFDA (2026). This is for informational purposes only and is not medical advice. This registry does not provide individual medication-combination directions.
Read our methodology - how this data is sourced, computed, and verified.