What the FDA labels say about taking them together
Abiraterone and thioridazine
Abiraterone's FDA label of March 28, 2025 names thioridazine in its drug interactions section; the thioridazine label PlainMeds reads does not name abiraterone. The abiraterone label: “Avoid co-administration of abiraterone acetate with substrates of CYP2D6 with a narrow therapeutic index (e.g., thioridazine).”
Check it at the source: the abiraterone FDA label on DailyMed (effective March 28, 2025, Janssen Biotech, Inc.); the thioridazine FDA label on DailyMed (effective November 11, 2025, Mylan Institutional Inc.).
What does the abiraterone label say about thioridazine?
Abiraterone label, drug interactionsAvoid co-administration of abiraterone acetate with substrates of CYP2D6 with a narrow therapeutic index (e.g., thioridazine).
Source: FDA drug label (Zytiga), Janssen Biotech, Inc., effective March 28, 2025 (SPL set 4e338e89-3cf2-48eb-b6e2-a06c608c6513), via openFDA; the full label on DailyMed
What does the thioridazine label say about abiraterone?
Thioridazine's label (effective November 11, 2025) does not name abiraterone in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Thioridazine Hydrochloride), Mylan Institutional Inc., effective November 11, 2025 (SPL set 52fea941-0b47-41c1-b00d-f88150e8ab93), 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
| Abiraterone | Thioridazine | |
|---|---|---|
| Labeled for | Prostate cancer | n/a |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | $0.774 per tablet 250 mg tablet | $0.571 per tablet 25 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