What the FDA labels say about taking them together
Diltiazem and lurasidone
Lurasidone's FDA label of January 31, 2025 names diltiazem in its drug interactions section; the diltiazem labels PlainMeds reads (4) do not name lurasidone. The lurasidone label: “Concomitant use of LATUDA with moderate CYP3A4 inhibitors increased the exposure of lurasidone compared to the use of LATUDA alone.”
Check it at the source: the diltiazem FDA label on DailyMed (effective August 7, 2026, Bausch Health US, LLC); the lurasidone FDA label on DailyMed (effective January 31, 2025, Sumitomo Pharma America, Inc.).
What does the diltiazem label say about lurasidone?
Diltiazem's label (effective August 7, 2026) and its 3 other brand-application labels do not name lurasidone in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (TIAZAC EXTENDED RELEASE), Bausch Health US, LLC, effective August 7, 2026 (SPL set c567fe7e-887e-4291-a0d1-2dd3f25cbf25), via openFDA; the full label on DailyMed
What does the lurasidone label say about diltiazem?
Lurasidone label, drug interactionsModerate CYP3A4 Inhibitors Clinical Impact: Concomitant use of LATUDA with moderate CYP3A4 inhibitors increased the exposure of lurasidone compared to the use of LATUDA alone. Intervention: LATUDA dose should be reduced to half of the original level when used concomitantly with moderate inhibitors of CYP3A4 [see Dosage and Administration ()]. Examples: Diltiazem, atazanavir, erythromycin, fluconazole, verapamil
Source: FDA drug label (Latuda), NDA200603 (Sunovion Pharms Inc), as published by Sumitomo Pharma America, Inc., effective January 31, 2025 (SPL set afad3051-9df2-4c54-9684-e8262a133af8), 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
| Diltiazem | Lurasidone | |
|---|---|---|
| Labeled for | High blood pressure, Angina, Atrial fibrillation | Schizophrenia, Bipolar disorder, Depression |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | $0.144 per capsule 24h ER(cd) 120 mg capsule | $0.142 per tablet 20 mg tablet |
| Shortage now | A presentation being discontinued | 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