What the FDA labels say about taking them together
Diltiazem and nevirapine
Nevirapine's FDA label of July 15, 2026 names diltiazem in its drug interactions section; the diltiazem labels PlainMeds reads (4) do not name nevirapine. The nevirapine label: “Calcium Channel blockers: Diltiazem, nifedipine, verapamil Plasma concentrations may be decreased.”
Check it at the source: the diltiazem FDA label on DailyMed (effective August 7, 2026, Bausch Health US, LLC); the nevirapine FDA label on DailyMed (effective July 15, 2026, Mylan Pharmaceuticals Inc.).
What does the diltiazem label say about nevirapine?
Diltiazem's label (effective August 7, 2026) and its 3 other brand-application labels do not name nevirapine 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 nevirapine label say about diltiazem?
Nevirapine label, drug interactionsCalcium Channel blockers: Diltiazem, nifedipine, verapamil Plasma concentrations may be decreased.
Source: FDA drug label (Nevirapine), Mylan Pharmaceuticals Inc., effective July 15, 2026 (SPL set c6e93829-7024-48f6-8023-da6ff27dfc0a), 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 | Nevirapine | |
|---|---|---|
| Labeled for | High blood pressure, Angina, Atrial fibrillation | HIV |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | $0.144 per capsule 24h ER(cd) 120 mg capsule | $0.147 per tablet 200 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