What the FDA labels say about taking them together
Diltiazem and dutasteride
Dutasteride's FDA label of September 11, 2025 names diltiazem in its drug interactions section; the diltiazem labels PlainMeds reads (4) do not name dutasteride. The dutasteride label: “Coadministration of verapamil or diltiazem decreases dutasteride clearance and leads to increased exposure to dutasteride.”
Check it at the source: the diltiazem FDA label on DailyMed (effective August 7, 2026, Bausch Health US, LLC); the dutasteride FDA label on DailyMed (effective September 11, 2025, Aurobindo Pharma Limited).
What does the diltiazem label say about dutasteride?
Diltiazem's label (effective August 7, 2026) and its 3 other brand-application labels do not name dutasteride 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 dutasteride label say about diltiazem?
Dutasteride label, drug interactionsCoadministration of verapamil or diltiazem decreases dutasteride clearance and leads to increased exposure to dutasteride.
Source: FDA drug label (Dutasteride), Aurobindo Pharma Limited, effective September 11, 2025 (SPL set b32611f3-50ec-45bb-a671-ea10cec7829d), 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 | Dutasteride | |
|---|---|---|
| Labeled for | High blood pressure, Angina, Atrial fibrillation | Enlarged prostate (BPH) |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | $0.144 per capsule 24h ER(cd) 120 mg capsule | $0.157 per capsule 0.5 mg capsule |
| 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