What the FDA labels say about taking them together
Atazanavir and felodipine
Atazanavir's FDA label of August 6, 2025 names felodipine in its drug interactions section; the felodipine label PlainMeds reads does not name atazanavir. The atazanavir label: “Caution is warranted. Dose titration of the calcium channel blocker should be considered. ECG monitoring is recommended.”
Check it at the source: the atazanavir FDA label on DailyMed (effective August 6, 2025, Aurobindo Pharma Limited); the felodipine FDA label on DailyMed (effective August 11, 2026, Heritage Pharmaceuticals Inc. d/b/a Avet Pharmaceuticals Inc.).
What does the atazanavir label say about felodipine?
Atazanavir label, drug interactionsConcomitant Drug Class/Specific Drugs: felodipine, nifedipine, nicardipine, and verapamil; Effect on Concentration of Atazanavir or Concomitant Drug: ↑ calcium channel blocker; Clinical Comment: Caution is warranted. Dose titration of the calcium channel blocker should be considered. ECG monitoring is recommended.
Source: FDA drug label (Atazanavir Sulfate), Aurobindo Pharma Limited, effective August 6, 2025 (SPL set 7fbea274-d6b5-4faa-bbf0-05fefab42114), via openFDA; the full label on DailyMed
What does the felodipine label say about atazanavir?
Felodipine's label (effective August 11, 2026) does not name atazanavir in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (FELODIPINE), Heritage Pharmaceuticals Inc. d/b/a Avet Pharmaceuticals Inc., effective August 11, 2026 (SPL set 0bef7cf2-012b-4804-ac93-0a8b333035db), 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
| Atazanavir | Felodipine | |
|---|---|---|
| Labeled for | HIV | High blood pressure |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | $2.23 per capsule 300 mg capsule | $0.123 per tablet 5 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