What the FDA labels say about taking them together
Heparin and olmesartan
Olmesartan's FDA label of September 23, 2025 names heparin in its drug interactions section; the heparin labels PlainMeds reads (4) do not name olmesartan. The olmesartan label: “… containing potassium or other drugs that may increase potassium levels (e.g., heparin) may lead to increases in serum potassium.”
Check it at the source: the heparin FDA label on DailyMed (effective November 28, 2025, Fresenius Kabi USA, LLC); the olmesartan FDA label on DailyMed (effective September 23, 2025, Cosette Pharmaceuticals, Inc.).
What does the heparin label say about olmesartan?
Heparin's label (effective November 28, 2025) and its 3 other brand-application labels do not name olmesartan in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Heparin Sodium), Fresenius Kabi USA, LLC, effective November 28, 2025 (SPL set d55b4a63-0c04-4874-b74f-9e9b9e8b008c), via openFDA; the full label on DailyMed
What does the olmesartan label say about heparin?
Olmesartan label, drug interactionsConcomitant use of olmesartan with other agents that block the renin-angiotensin system, potassium-sparing diuretics (e.g., spironolactone, triamterene, amiloride), potassium supplements, salt substitutes containing potassium or other drugs that may increase potassium levels (e.g., heparin) may lead to increases in serum potassium.
Source: FDA drug label (Benicar), Cosette Pharmaceuticals, Inc., effective September 23, 2025 (SPL set dc3f1fd4-5578-4c5d-be7b-12e3f8f3e7df), via openFDA; the full label on DailyMed
These are the labels' own sentences. PlainMeds does not grade interactions; a pharmacist or prescriber can say what they mean for one person's medicines.
Both medicines on the record
| Heparin | Olmesartan | |
|---|---|---|
| Labeled for | Blood clots (DVT and PE), Atrial fibrillation | High blood pressure |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | $1.18 per mL 5,000 unit/mL vial | $0.0805 per tablet 20 mg tablet |
| Shortage now | In shortage | No current entry |
Source: FDA NDC Directory, CMS NADAC of October 7, 2026 and the FDA Drug Shortage Database (FDA files October 8, 2026)
What next?
- Check more medicines together
- up to five at once