What the FDA labels say about taking them together
Quinidine and ziprasidone
Ziprasidone's FDA label of July 20, 2026 names quinidine in its contraindications section; the quinidine label PlainMeds reads does not name ziprasidone. The ziprasidone label: “Therefore, ziprasidone should not be given with: dofetilide, sotalol, quinidine, other Class Ia and III anti-arrhythmics, mesoridazine, thioridazine, chlorpromazine, droperidol, pimozide, sparfloxacin, gatifloxacin …”
Check it at the source: the quinidine FDA label on DailyMed (effective February 1, 2018, Sun Pharmaceutical Industries, Inc.); the ziprasidone FDA label on DailyMed (effective July 20, 2026, Apotex Corp.).
What does the quinidine label say about ziprasidone?
Quinidine's label (effective February 1, 2018) does not name ziprasidone 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 ziprasidone label say about quinidine?
Ziprasidone label, contraindicationsTherefore, ziprasidone should not be given with: dofetilide, sotalol, quinidine, other Class Ia and III anti-arrhythmics, mesoridazine, thioridazine, chlorpromazine, droperidol, pimozide, sparfloxacin, gatifloxacin, moxifloxacin, halofantrine, mefloquine, pentamidine, arsenic trioxide, levomethadyl acetate, dolasetron mesylate, probucol or tacrolimus. other drugs that have demonstrated QT prolongation as one of their pharmacodynamic effects and have this effect described in the full prescribing information as a contraindication or a boxed or bolded warning [see Warnings and Precautions (5.3) ].
Source: FDA drug label (ziprasidone hydrochloride), Apotex Corp., effective July 20, 2026 (SPL set ccfd5ba2-7271-f3dd-4c98-7418c1a4b54a), 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 | Ziprasidone | |
|---|---|---|
| Labeled for | Atrial fibrillation | Bipolar disorder, Schizophrenia |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | $4.92 per tablet 324 mg tablet | $0.269 per capsule 20 mg capsule |
| 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