What the FDA labels say about taking them together
Allantoin and rasburicase
Rasburicase's FDA label of July 30, 2026 names allantoin in its warnings and precautions section; the allantoin label PlainMeds reads does not name rasburicase. The rasburicase label: “Elitek is contraindicated in patients with G6PD deficiency because hydrogen peroxide is one of the major by-products of the conversion of uric acid to allantoin.”
Check it at the source: the allantoin FDA label on DailyMed (effective August 5, 2025); the rasburicase FDA label on DailyMed (effective July 30, 2026, Sanofi-Aventis U.S. LLC).
What does the allantoin label say about rasburicase?
Allantoin's label (effective August 5, 2025) does not name rasburicase in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Earthmed Lip Balm Strawberry Rhubarb), Earthmed LLC, effective August 5, 2025 (SPL set 3b54eea1-2e09-2ee1-e063-6294a90a52e5), via openFDA; the full label on DailyMed
What does the rasburicase label say about allantoin?
Rasburicase label, warnings and precautionsElitek is contraindicated in patients with G6PD deficiency because hydrogen peroxide is one of the major by-products of the conversion of uric acid to allantoin.
Source: FDA drug label (Elitek), Sanofi-Aventis U.S. LLC, effective July 30, 2026 (SPL set 0ae10bc4-6b65-402f-9db5-2d7753054922), 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
| Allantoin | Rasburicase | |
|---|---|---|
| Labeled for | Herpes and shingles | n/a |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | n/a | n/a |
| 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