What the FDA labels say about taking them together
Fluvoxamine and quinidine
Fluvoxamine's FDA label of June 27, 2026 names quinidine in its drug interactions section; the quinidine label PlainMeds reads does not name fluvoxamine. The fluvoxamine label: “Caution is indicated in patients known to have reduced levels of CYP2D6 activity and those receiving concomitant drugs known to inhibit this cytochrome P450 isoenzyme (e.g., quinidine).”
Check it at the source: the fluvoxamine FDA label on DailyMed (effective June 27, 2026, Zydus Pharmaceuticals USA Inc.); the quinidine FDA label on DailyMed (effective February 1, 2018, Sun Pharmaceutical Industries, Inc.).
What does the fluvoxamine label say about quinidine?
Fluvoxamine label, drug interactionsCaution is indicated in patients known to have reduced levels of cytochrome P450 2D6 activity and those receiving concomitant drugs known to inhibit this cytochrome P450 isoenzyme (e.g., quinidine).
Source: FDA drug label (Fluvoxamine Maleate, NDA021519), ANI Pharmaceuticals, Inc., effective August 4, 2025 (SPL set 7ecd83ec-88f5-4f85-9cc2-9068375d8820), via openFDA
Source: FDA drug label (Fluvoxamine maleate extended-release), Zydus Pharmaceuticals USA Inc., effective June 27, 2026 (SPL set 6c71d4f6-54b5-4d3a-8d2f-b7773c92c32e), via openFDA; the full label on DailyMed
What does the quinidine label say about fluvoxamine?
Quinidine's label (effective February 1, 2018) does not name fluvoxamine 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
| Fluvoxamine | Quinidine | |
|---|---|---|
| Labeled for | n/a | Atrial fibrillation |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | $4.08 per capsule 100 mg capsule | $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