What the FDA labels say about taking them together
Clonazepam and treosulfan
Treosulfan's FDA label of January 31, 2025 names clonazepam in its warnings and precautions section; the clonazepam label PlainMeds reads does not name treosulfan. The treosulfan label: “WARNINGS AND PRECAUTIONS Seizures: Monitor signs of neurological adverse reactions and consider clonazepam prophylaxis for patients at higher risk. Skin disorders:”
Check it at the source: the clonazepam FDA label on DailyMed (effective December 1, 2025, H2-Pharma, LLC); the treosulfan FDA label on DailyMed (effective January 31, 2025, Medexus Pharma, Inc.).
What does the clonazepam label say about treosulfan?
Clonazepam's label (effective December 1, 2025) does not name treosulfan in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Klonopin), NDA017533 (Cheplapharm), as published by H2-Pharma, LLC, effective December 1, 2025 (SPL set cfa0d79a-843c-4b88-95a1-e9511d649ca1), via openFDA; the full label on DailyMed
What does the treosulfan label say about clonazepam?
Treosulfan label, warnings and precautionsWARNINGS AND PRECAUTIONS Seizures: Monitor signs of neurological adverse reactions and consider clonazepam prophylaxis for patients at higher risk. ( 5.2 ) Skin disorders:
Source: FDA drug label (GRAFAPEX), Medexus Pharma, Inc., effective January 31, 2025 (SPL set 2d06b03c-17aa-0492-e063-6294a90abd8f), 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
| Clonazepam | Treosulfan | |
|---|---|---|
| Labeled for | Seizures and epilepsy, Anxiety | n/a |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | $0.0244 per tablet 1 mg tablet | n/a |
| Shortage now | In shortage | 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