What the FDA labels say about taking them together
Doxazosin and terazosin
Doxazosin's FDA label of October 15, 2023 names terazosin in its contraindications section; the terazosin labels PlainMeds reads (2) do not name doxazosin. The doxazosin label: “CONTRAINDICATIONS The use of CARDURA is contraindicated in patients with a hypersensitivity to doxazosin, other quinazolines, or any of its components.”
Check it at the source: the doxazosin FDA label on DailyMed (effective October 15, 2023, Viatris Specialty LLC); the terazosin FDA label on DailyMed (effective May 5, 2026, Jubilant Cadista Pharmaceuticals Inc.).
What does the doxazosin label say about terazosin?
Doxazosin label, contraindicationsCONTRAINDICATIONS The use of CARDURA is contraindicated in patients with a hypersensitivity to doxazosin, other quinazolines (e.g., prazosin, terazosin), or any of its components.
Source: FDA drug label (Cardura Xl, NDA021269), Viatris Specialty LLC, effective May 15, 2023 (SPL set 355bcdce-0481-48ba-8ebd-2009106aaf77), via openFDA
Source: FDA drug label (Cardura), Viatris Specialty LLC, effective October 15, 2023 (SPL set 5e1f5e49-2da1-43ab-9795-228a8bcc5a82), via openFDA; the full label on DailyMed
What does the terazosin label say about doxazosin?
Terazosin's label (effective May 5, 2026) and its 1 other brand-application label do not name doxazosin in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Terazosin), Jubilant Cadista Pharmaceuticals Inc., effective May 5, 2026 (SPL set 43e92495-2cf2-46dd-a80c-f0c3c88c7b73), 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
| Doxazosin | Terazosin | |
|---|---|---|
| Labeled for | Enlarged prostate (BPH), High blood pressure | Enlarged prostate (BPH), High blood pressure |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | $0.0752 per tablet 1 mg tablet | $0.106 per capsule 2 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