What the FDA labels say about taking them together
Isoniazid and triamcinolone
Triamcinolone's FDA label (Triesence) of June 5, 2026 names isoniazid in its drug interactions section; the isoniazid label PlainMeds reads does not name triamcinolone. The triamcinolone label: “Antitubercular drugs: Serum concentrations of isoniazid may be decreased.”
Check it at the source: the isoniazid FDA label on DailyMed (effective July 8, 2025, OMNIVIUM PHARMACEUTICALS LLC.); the triamcinolone FDA label on DailyMed (effective January 28, 2026, E. Fougera & Co. a division of Fougera Pharmaceuticals, LLC).
What does the isoniazid label say about triamcinolone?
Isoniazid's label (effective July 8, 2025) does not name triamcinolone in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (isoniazid), OMNIVIUM PHARMACEUTICALS LLC., effective July 8, 2025 (SPL set 35400f1d-fd25-4bfa-a382-ac390e21bf2e), via openFDA; the full label on DailyMed
What does the triamcinolone label say about isoniazid?
Triesence label (Harrow Eye, LLC, June 5, 2026), drug interactionsAntitubercular drugs: Serum concentrations of isoniazid may be decreased.
Source: FDA drug label (Triesence, NDA022048), Harrow Eye, LLC, effective June 5, 2026 (SPL set 2267978c-72ad-9229-e063-6394a90a09d0), via openFDA
Source: FDA drug label (triamcinolone acetonide), E. Fougera & Co. a division of Fougera Pharmaceuticals, LLC, effective January 28, 2026 (SPL set 92a1ded0-8e1a-4994-9c8a-89e84fc85c94), 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
| Isoniazid | Triamcinolone | |
|---|---|---|
| Labeled for | n/a | Asthma, Eczema (atopic dermatitis), Anemia, Leukemia, lymphoma and myeloma, Allergies, Fever, Pain, Osteoarthritis |
| Boxed warning | Yes | No |
| Pharmacy cost (NADAC) | $3.40 per tablet 300 mg tablet | $0.0452 per gram 0.1% cream |
| Shortage now | No current entry | Listed; available |
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