What the FDA labels say about taking them together
Burosumab and calcifediol
Burosumab's FDA label of April 22, 2026 names calcifediol in its contraindications section; the calcifediol label PlainMeds reads does not name burosumab. The burosumab label: “CONTRAINDICATIONS CRYSVITA is contraindicated: In concomitant use with oral phosphate and/or active vitamin D analogs due to the risk of hyperphosphatemia.”
Check it at the source: the burosumab FDA label on DailyMed (effective April 22, 2026); the calcifediol FDA label on DailyMed (effective January 19, 2024, OPKO Pharmaceuticals LLC).
What does the burosumab label say about calcifediol?
Burosumab label, contraindicationsCONTRAINDICATIONS CRYSVITA is contraindicated: In concomitant use with oral phosphate and/or active vitamin D analogs (e.g. calcitriol, paricalcitol, doxercalciferol, calcifediol) due to the risk of hyperphosphatemia [see Warnings and Precautions (5.2) and Drug Interactions (7.1) ].
Source: FDA drug label (CRYSVITA), Kyowa Kirin, Inc., effective April 22, 2026 (SPL set 102f96a0-6e3a-4fc1-b204-34d604683af6), via openFDA; the full label on DailyMed
What does the calcifediol label say about burosumab?
Calcifediol's label (effective January 19, 2024) does not name burosumab in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Rayaldee), NDA208010 (Eirgen), as published by OPKO Pharmaceuticals LLC, effective January 19, 2024 (SPL set 6a95effd-32a5-46b6-a30e-7f4f9bf8cc77), 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
| Burosumab | Calcifediol | |
|---|---|---|
| Labeled for | n/a | n/a |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | n/a | $41.26 per capsule 30 mcg capsule (hard) |
| 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