What the FDA labels say about taking them together
Fosamprenavir and isradipine
Fosamprenavir's FDA label of September 15, 2023 names isradipine in its drug interactions section; the isradipine label PlainMeds reads does not name fosamprenavir. The fosamprenavir label: “Use with caution. Clinical monitoring of patients is recommended.”
Check it at the source: the fosamprenavir FDA label on DailyMed (effective September 15, 2023, Mylan Pharmaceuticals Inc.); the isradipine FDA label on DailyMed (effective November 30, 2023, Teva Pharmaceuticals USA, Inc.).
What does the fosamprenavir label say about isradipine?
Fosamprenavir label, drug interactionsConcomitant Drug Class/Drug Name: Calcium channel blockers: Diltiazem, felodipine, nifedipine, nicardipine, nimodipine, verapamil, amlodipine, nisoldipine, isradipine; Effect on Concentration of Amprenavir or Concomitant Drug: ↑ Calcium channel blockers; Clinical Comment: Use with caution. Clinical monitoring of patients is recommended.
Source: FDA drug label (Fosamprenavir Calcium), Mylan Pharmaceuticals Inc., effective September 15, 2023 (SPL set 3a1424d8-844c-4e24-9ebd-b2c2b61b61a3), via openFDA; the full label on DailyMed
What does the isradipine label say about fosamprenavir?
Isradipine's label (effective November 30, 2023) does not name fosamprenavir in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Isradipine), Teva Pharmaceuticals USA, Inc., effective November 30, 2023 (SPL set bf3425e0-428d-4bdb-ac9a-3b9d483df83a), 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
| Fosamprenavir | Isradipine | |
|---|---|---|
| Labeled for | HIV | High blood pressure |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | n/a | $1.70 per capsule 5 mg capsule |
| 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