Cephalexin and Sucroferric Oxyhydroxide: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Cephalexin
Sucroferric Oxyhydroxide
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
Altered absorption of cephalexin
Interaction Deep Dive
An interaction between cephalexin and sucroferric oxyhydroxide was observed during in vitro pharmacokinetic studies under conditions which mimicked the environment of the gastrointestinal tract with and without the presence of phosphate. Administer cephalexin at least 1 hour before sucroferric oxyhydroxide1.
Why it happens (mechanism)
Altered phosphate concentrations in the gastrointestinal tract
Common questions
Can I take Cephalexin and Sucroferric Oxyhydroxide together?
Altered absorption of cephalexin Always confirm with your pharmacist or prescriber before making any change.
How serious is the Cephalexin and Sucroferric Oxyhydroxide interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.
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 Cephalexin or Sucroferric Oxyhydroxide 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 (1)
- Product Information: VELPHORO(R) oral chewable tablets, sucroferric oxyhydroxide oral chewable tablets. Fresenius Medical Care North America (per FDA), Waltham, MA, 2018. DailyMed
Keep reading about Cephalexin
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