What the FDA labels say about taking them together
Aripiprazole lauroxil and quinidine
Aripiprazole lauroxil's FDA label of January 28, 2025 names quinidine in its drug interactions section; the quinidine label PlainMeds reads does not name aripiprazole lauroxil. The aripiprazole lauroxil label: “Concomitant use of oral aripiprazole with strong CYP3A4 or CYP2D6 inhibitors increased the exposure of aripiprazole compared to the use of oral aripiprazole alone.”
Check it at the source: the aripiprazole lauroxil FDA label on DailyMed (effective January 28, 2025, Alkermes, Inc.); the quinidine FDA label on DailyMed (effective February 1, 2018, Sun Pharmaceutical Industries, Inc.).
What does the aripiprazole lauroxil label say about quinidine?
Aripiprazole lauroxil label, drug interactionsStrong CYP3A4 Inhibitors and CYP2D6 Inhibitors Clinical Impact: The concomitant use of oral aripiprazole with strong CYP3A4 or CYP2D6 inhibitors increased the exposure of aripiprazole compared to the use of oral aripiprazole alone. Intervention: With concomitant use of ARISTADA with a strong CYP3A4 inhibitor or CYP2D6 inhibitor for more than 2 weeks, reduce the ARISTADA dose [see Dosage and Administration ()]. Examples: itraconazole, clarithromycin, quinidine, fluoxetine, paroxetine
Aristada Initio label (Alkermes, Inc., January 28, 2025), drug interactionsStrong CYP3A4 Inhibitors and CYP2D6 Inhibitors Clinical Impact: Concomitant use of oral aripiprazole with strong CYP3A4 or CYP2D6 inhibitors increased the exposure of aripiprazole compared to the use of oral aripiprazole alone. Intervention: Avoid concomitant use of ARISTADA INITIO with strong CYP3A4 or strong CYP2D6 inhibitors because the dosage of ARISTADA INITIO cannot be modified [see Dosage and Administration ()]. Examples: itraconazole, clarithromycin, quinidine, fluoxetine, paroxetine
Source: FDA drug label (Aristada Initio, NDA209830), Alkermes, Inc., effective January 28, 2025 (SPL set b18fdfd9-31cd-4a2f-9f1c-ebc70d7a9403), via openFDA
Source: FDA drug label (ARISTADA), Alkermes, Inc., effective January 28, 2025 (SPL set 17a8d11b-73b0-4833-a0b4-cf1ef85edefb), via openFDA; the full label on DailyMed
What does the quinidine label say about aripiprazole lauroxil?
Quinidine's label (effective February 1, 2018) does not name aripiprazole lauroxil 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
| Aripiprazole lauroxil | Quinidine | |
|---|---|---|
| Labeled for | Schizophrenia | Atrial fibrillation |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | $993.60 per mL 1,064 mg/3.9 mL syringe | $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