Drug Interaction Report

Doxercalciferol Injection and Burosumab-Twza: Interaction Details

Name: Doxercalciferol Injection and Burosumab-Twza Interaction
Creator: Dr. Brian Staiger, PharmD, BCPS

A pharmacist-reviewed analysis of the Doxercalciferol Injection and Burosumab-Twza interaction: the documented clinical effects, severity rating, onset, mechanism, and management considerations, with cited references throughout.

AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature

Doxercalciferol Injection

Hectorol Hectorol®

Burosumab-Twza

No brand names on record

Medically reviewed by

Dr. Brian Staiger, PharmD, BCPS

Updated Aug 8, 2026

Editorial policy · Data sources

Interaction severity

Contraindicated

These should generally not be used together.

Minor

Moderate

Major

Contraindicated

How we grade severity & evidence

Severity levels

Contraindicated: These should generally not be used together.
Major: Potentially serious — often needs a change or close monitoring.
Moderate: Can be significant — usually manageable with monitoring.
Minor: Usually limited clinical impact.

Evidence grades

Established: Well documented — supported by controlled studies or strong clinical data.
Probable: Good supporting evidence, though not definitively proven.
Suspected: Some evidence suggests this interaction, but it is not well established.
Possible: Limited or conflicting evidence; the interaction may occur.
Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.

Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.

Of 5 documented Doxercalciferol Injection interactions, 1 is rated contraindicated — including this one.

Worried about symptoms right now? Contact your pharmacist or prescriber, or call Poison Control at 1-800-222-1222 (US). Call 911 for an emergency.

Onset

unspecified

Evidence

theoretical

Severity

Contraindicated

What happens

Increased risk of hyperphosphatemia

Interaction Deep Dive

Taking burosumab-twza together with active vitamin D analogs is contraindicated¹.

Why it happens (mechanism)

Additive effects on serum phosphorous levels

Common questions

Can I take Doxercalciferol Injection and Burosumab-Twza together?

Increased risk of hyperphosphatemia Always confirm with your pharmacist or prescriber before making any change.

How serious is the Doxercalciferol Injection and Burosumab-Twza interaction?

It is rated contraindicated. These should generally not be used together.

How quickly could this interaction happen?

The documented onset is "unspecified". The timing of this interaction is not well characterized.

How strong is the evidence for this interaction?

The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.

Questions for your pharmacist

Does my dose of Doxercalciferol Injection or Burosumab-Twza need adjusting while I take them together?
What symptoms should prompt me to call you or my prescriber right away?
Does the timing of my doses matter for this combination?
Is there a safer alternative to one of these medications for me?

References (1)

Product Information: Crysvita(R) subcutaneous injection, burosumab-twza subcutaneous injection. Ultragenyx Pharmaceutical Inc (per manufacturer), Novato, CA, 2018. DailyMed

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Doxercalciferol Injection

Keep reading about Doxercalciferol Injection

All Doxercalciferol Injection interactions (5) Doxercalciferol Injection drug information

Also serious with: Digoxin

Burosumab-Twza

Keep reading about Burosumab-Twza

All Burosumab-Twza interactions (6)

Also serious with: Calcifediol Calcitriol Calcitriol Topical Doxercalciferol

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HelloPharmacist doesn't license one of the big commercial interaction databases, so what you'll find here is not a complete list of every known drug interaction. Instead, each entry is researched, analyzed, and written up individually — documented from the published literature, reviewed by a pharmacist, and cited so you can check every source yourself.

If a combination isn't listed here, it means we haven't documented it yet — never that it's safe. For screening a full medication list, we recommend pairing this site with a comprehensive tool like the Drugs.com Interaction Checker and, most importantly, a review by your own pharmacist. For a deep, plain-English, fully sourced explanation of a specific documented interaction — that's exactly what we built this for.

This information is for education, not a substitute for professional medical advice. Do not start, stop, or change any medication without talking to your pharmacist or prescriber.