What the FDA labels say about taking them together
Paliperidone and quinidine
Paliperidone's FDA label of January 31, 2025 names quinidine in its warnings and precautions section; the quinidine label PlainMeds reads does not name paliperidone.
Check it at the source: the paliperidone FDA label on DailyMed (effective January 31, 2025, Janssen Pharmaceuticals, Inc.); the quinidine FDA label on DailyMed (effective February 1, 2018, Sun Pharmaceutical Industries, Inc.).
What does the paliperidone label say about quinidine?
Paliperidone label, warnings and precautionsThe use of paliperidone should be avoided in combination with other drugs that are known to prolong QTc including Class 1A (e.g., quinidine, procainamide) or Class III (e.g., amiodarone, sotalol) antiarrhythmic medications, antipsychotic medications (e.g., chlorpromazine, thioridazine), antibiotics (e.g., gatifloxacin, moxifloxacin), or any other class of medications known to prolong the QTc interval.
Source: FDA drug label (INVEGA), Janssen Pharmaceuticals, Inc., effective January 31, 2025 (SPL set 7b8e5b26-b9e4-4704-921b-3c3c0d159916), via openFDA; the full label on DailyMed
What does the quinidine label say about paliperidone?
Quinidine's label (effective February 1, 2018) does not name paliperidone 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
| Paliperidone | Quinidine | |
|---|---|---|
| Labeled for | Schizophrenia | Atrial fibrillation |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | $0.972 per tablet 3 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