Drug Interaction Report

Magnesium Oxide and Dasatinib: Interaction Details

A pharmacist-reviewed analysis of the Magnesium Oxide and Dasatinib 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

Magnesium Oxide

Mag-Ox 400 Mag-Ox® Magmilax Maox® Phillips' Cramp-free Uro-Mag Uro-Mag®
+

Dasatinib

Phyrago Sprycel Sprycel®
Dr. Brian Staiger, PharmD, BCPS
Medically reviewed by
Dr. Brian Staiger, PharmD, BCPS
Updated Aug 8, 2026
Editorial policy · Data sources
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Interaction severity
Moderate
Can be significant — usually manageable with monitoring.
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 51 documented Magnesium Oxide interactions, 30 are rated moderate — including this one.
Onset
unspecified
Evidence
theoretical
Severity
Moderate

What happens

Reduced dasatinib exposure

Interaction Deep Dive

Avoid simultaneous administration of dasatinib and antacids as this may result in decreased dasatinib exposure. If antacid therapy is necessary in patients receiving dasatinib, administer the antacid either 2 hours prior to or 2 hours after administration of the dasatinib dose. Coadministration of dasatinib and aluminum hydroxide/magnesium hydroxide (an antacid) resulted in dasatinib mean AUC and Cmax decreasing by 55% and 58%, respectively. However, when the same antacid dose was administered 2 hours before dasatinib, there was a 26% decrease in mean dasatinib Cmax and no significant change in mean AUC21.

Why it happens (mechanism)

Inhibition of gastric acid

Literature reports

2 reports — tap to read

a) Following simultaneous administration of a single dose of dasatinib and 30 mL of aluminum hydroxide/magnesium hydroxide (an antacid), dasatinib mean AUC and Cmax decreased by 55% and 58%, respectively. However, when the same antacid dose was administered 2 hours before the dasatinib dose, there was a 26% decrease in mean Cmax and no significant change in mean dasatinib AUC 2.

b) The dasatinib Cmax decreased by 47.9% and AUC by 31.7% following concomitant use with a calcium carbonate antacid 1.

Common questions

Can I take Magnesium Oxide and Dasatinib together?

Reduced dasatinib exposure Always confirm with your pharmacist or prescriber before making any change.

How serious is the Magnesium Oxide and Dasatinib interaction?

It is rated moderate. Can be significant — usually manageable with monitoring.

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 Magnesium Oxide or Dasatinib 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 anything you'd monitor while I'm on both?

References (2)

  1. Product Information: PHYRAGO oral tablets, dasatinib oral tablets. Nanocopoeia, LLC (per FDA), New Brighton, MN, 2023. DailyMed
  2. Product Information: SPRYCEL(R) oral tablets, dasatinib oral tablets. Bristol-Myers Squibb Company (per FDA), Princeton, NJ, 2023. DailyMed
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Magnesium Oxide

Keep reading about Magnesium Oxide

All Magnesium Oxide interactions (51) Magnesium Oxide drug information
Also serious with: Hydroxychloroquine Neratinib Mefenamic Acid Gefitinib
Dasatinib

Keep reading about Dasatinib

All Dasatinib interactions (342) Dasatinib drug information
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Beyond drug–drug

These medications also interact with supplements

Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:

Dasatinib + Activated Charcoal American Hellebore Arsenic Cesium Ephedra Grapefruit Sida Cordifolia St. John's Wort + 138 more

major · moderate · minor — check everything you take with our drug–supplement interaction checker.

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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.