What the FDA labels say about taking them together
Quinidine and sucralfate
Sucralfate's FDA label of September 2, 2026 names quinidine in its drug interactions section; the quinidine label PlainMeds reads does not name sucralfate. The sucralfate label: “… digoxin, fluoroquinolone antibiotics, ketoconazole, l-thyroxine, phenytoin, quinidine, ranitidine, tetracycline, and theophylline.”
Check it at the source: the quinidine FDA label on DailyMed (effective February 1, 2018, Sun Pharmaceutical Industries, Inc.); the sucralfate FDA label on DailyMed (effective September 2, 2026, Preferred Pharmaceuticals Inc.).
What does the quinidine label say about sucralfate?
Quinidine's label (effective February 1, 2018) does not name sucralfate 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
What does the sucralfate label say about quinidine?
Sucralfate label, drug interactionsDrug Interactions Some studies have shown that simultaneous sucralfate administration in healthy volunteers reduced the extent of absorption (bioavailability) of single doses of the following: cimetidine, digoxin, fluoroquinolone antibiotics, ketoconazole, l-thyroxine, phenytoin, quinidine, ranitidine, tetracycline, and theophylline.
Source: FDA drug label (Sucralfate), NDA018333 (Abbvie), as published by Preferred Pharmaceuticals Inc., effective September 2, 2026 (SPL set 536b8c00-13ab-4397-a754-63a1c92bf883), 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
| Quinidine | Sucralfate | |
|---|---|---|
| Labeled for | Atrial fibrillation | Acid reflux and ulcers |
| Boxed warning | Yes | No |
| Pharmacy cost (NADAC) | $4.92 per tablet 324 mg tablet | $0.173 per tablet 1 g 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