What the FDA labels say about taking them together
Nisoldipine and quinidine
Nisoldipine's FDA label of March 12, 2026 names quinidine in its drug interactions section; the quinidine label PlainMeds reads does not name nisoldipine. The nisoldipine label: “Quinidine at 648 mg bid decreased the bioavailability (AUC) of nisoldipine by 26%, but not the peak concentration.”
Check it at the source: the nisoldipine FDA label on DailyMed (effective March 12, 2026, Covis Pharma US, Inc); the quinidine FDA label on DailyMed (effective February 1, 2018, Sun Pharmaceutical Industries, Inc.).
What does the nisoldipine label say about quinidine?
Nisoldipine label, drug interactionsQuinidine at 648 mg bid decreased the bioavailability (AUC) of nisoldipine by 26%, but not the peak concentration.
Source: FDA drug label (Sular), NDA020356 (Azurity), as published by Covis Pharma US, Inc, effective March 12, 2026 (SPL set 589157fa-d129-4de3-be3d-e0e1c22c5873), via openFDA; the full label on DailyMed
What does the quinidine label say about nisoldipine?
Quinidine's label (effective February 1, 2018) does not name nisoldipine in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Quinidine Gluconate), Sun Pharmaceutical Industries, Inc., effective February 1, 2018 (SPL set 5023f053-fcc4-4c2c-aa59-9ec198ad185e), 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
| Nisoldipine | Quinidine | |
|---|---|---|
| Labeled for | High blood pressure | Atrial fibrillation |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | $5.24 per tablet 34 mg tablet | $4.92 per tablet 324 mg tablet |
| Shortage now | No current entry | 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