What the FDA labels say about taking them together
Fosamprenavir and quetiapine
Fosamprenavir's FDA label of September 15, 2023 names quetiapine in its drug interactions section; the quetiapine labels PlainMeds reads (2) do not name fosamprenavir. The fosamprenavir label: “Consider alternative antiretroviral therapy to avoid increases in quetiapine drug exposures.”
Check it at the source: the fosamprenavir FDA label on DailyMed (effective September 15, 2023, Mylan Pharmaceuticals Inc.); the quetiapine FDA label on DailyMed (effective April 10, 2026, H2-Pharma, LLC).
What does the fosamprenavir label say about quetiapine?
Fosamprenavir label, drug interactionsConsider alternative antiretroviral therapy to avoid increases in quetiapine drug exposures.
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 quetiapine label say about fosamprenavir?
Quetiapine's label (effective April 10, 2026) and its 1 other brand-application label do 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 (SEROQUEL), NDA020639 (Cheplapharm), as published by H2-Pharma, LLC, effective April 10, 2026 (SPL set 8ae62aaf-f8c5-417f-baac-0098369ca322), 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 | Quetiapine | |
|---|---|---|
| Labeled for | HIV | Schizophrenia, Bipolar disorder, Depression |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | n/a | $0.127 per tablet 300 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