Magaldrate and Hydroxychloroquine: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Hydroxychloroquine
Magaldrate
No brand names on record
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.
What happens
Reduced hydroxychloroquine exposure
Interaction Deep Dive
Antacids and kaolin can reduce absorption of hydroxychloroquine; an interval of at least 4 hours between intake of these agents and hydroxychloroquine sulfate should be observed21.
Why it happens (mechanism)
Reduced absorption of hydroxychloroquine; changes in gastric pH
Common questions
Can I take Magaldrate and Hydroxychloroquine together?
Reduced hydroxychloroquine exposure Always confirm with your pharmacist or prescriber before making any change.
How serious is the Magaldrate and Hydroxychloroquine interaction?
It is rated major. Potentially serious — often needs a change or close 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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Magaldrate or Hydroxychloroquine 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 (2)
- Product Information: SOVUNA(R) oral tablets, hydroxychloroquine sulfate oral tablets. ANI Pharmaceuticals, Inc. (per FDA), Baudette, MN, 2024. DailyMed
- US Food & Drug Administration (FDA): Fact sheet for health care providers emergency use authorization (EUA) of hydroxychloroquine sulfate supplied from the strategic national stockpile for treatment of COVID-19 in certain hospitalized patients. US Food & Drug Administration (FDA). Silver Spring, MD. 2020.
Keep reading about Hydroxychloroquine
Keep reading about Magaldrate
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:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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