The short answer
Magnesium hydroxide can act as an antacid. With oral cefuroxime axetil, follow the antibiotic’s short-acting-antacid instruction: take cefuroxime at least one hour before or two hours after. The magnitude of the effect from a particular product remains uncertain.
What this answer covers
Oral cefuroxime axetil and oral magnesium hydroxide products with acid-neutralizing activity, including combination antacids. Milk of magnesia used as a laxative may require its own dose and schedule review.
- Supplement or preparation
- Magnesium hydroxide
- Medication ingredient
- cefuroxime
Why is this ingredient relevant?
The NCI reference identifies magnesium hydroxide as an acid-neutralizing ingredient. Oral cefuroxime axetil labeling states that reduced gastric acidity may lower bioavailability. This supports applying the label’s antacid precaution to the relevant magnesium hydroxide preparation.
How do I apply the interval?
For a short-acting antacid, take the antibiotic at least one hour before or two hours after it. A milk-of-magnesia bottle may be used for constipation at a different dose than an antacid. Have that exact use checked, rather than assuming all doses or schedules are interchangeable.
Has the absorption loss been measured directly?
No magnesium-hydroxide-only human effect size for cefuroxime axetil was verified. An in vitro paper used cefuroxime sodium and antacids, which is a different preparation and setting. Results for cefpodoxime or other antibiotics also cannot supply a cefuroxime percentage.
What are the limits of the recommendation?
The timing advice concerns oral cefuroxime axetil and a product that changes stomach acidity. It does not establish the same interaction with injected cefuroxime. Keep prescribed antibiotic doses on schedule and ask the pharmacist to reconcile repeated antacid or laxative use.
Evidence and practical considerations
Absorption & effectiveness
Magnesium hydroxide can act as an antacid. With oral cefuroxime axetil, follow the antibiotic’s short-acting-antacid instruction: take cefuroxime at least one hour before or two hours after. The magnitude of the effect from a particular product remains uncertain.
- Exact scope
- Oral cefuroxime axetil and oral magnesium hydroxide products with acid-neutralizing activity, including combination antacids. Milk of magnesia used as a laxative may require its own dose and schedule review. with oral cefuroxime axetil, converted to cefuroxime; not injected cefuroxime sodium
- Medication form and route
- oral
- Timing or duration
- During co-use; study-specific durations are retained in the source summaries. No universal duration or dose-response inferred.
What remains uncertain
- Label-based, mechanism-linked precaution, without a verified isolated human magnesium hydroxide effect. Laxative-dose conditions are not quantified.
Factors that may matter: exact supplement preparation and dose; oral versus nonoral medication route; other formula ingredients; gastric-acidity effect and concurrent treatment.
Read the supporting source summaries
Source 1: regulatory product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People receiving oral cefuroxime axetil tablets.
Reduced stomach acidity can lower oral bioavailability. Administer antibiotic at least one hour before or two hours after short-acting antacids. Label also warns about C. difficile-associated diarrhea.
How this applies: RxCUI 2194 active cefuroxime is reached after oral axetil conversion. Gastric-pH effect is restricted to oral axetil, not injected cefuroxime sodium. Exact package scope: Oral cefuroxime axetil and oral magnesium hydroxide products with acid-neutralizing activity, including combination antacids. Milk of magnesia used as a laxative may require its own dose and schedule review.
Antacid class precaution does not quantify the effect of every mineral salt; tablets and suspension are not interchangeable milligram for milligram.
Source 2: government drug-identity reference
cancer.gov · Source check Sep 10, 2026
Population: Users of oral aluminum hydroxide and magnesium hydroxide suspension.
Identifies these hydroxides as acid-neutralizing antacid ingredients.
How this applies: Supports applying an antacid-class precaution to these acid-neutralizing preparations, not to all aluminum or magnesium exposures. Exact package scope: Oral cefuroxime axetil and oral magnesium hydroxide products with acid-neutralizing activity, including combination antacids. Milk of magnesia used as a laxative may require its own dose and schedule review.
No clinical cefuroxime data or isolated ingredient effect size.
Source 3: in vitro interaction experiment
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: Laboratory drug-availability systems, not patients.
Study addresses chemical availability in vitro. It does not report a human cefuroxime-axetil coadministration trial.
How this applies: Explicit exclusion boundary: not evidence that oral minerals reduce absorption of injected cefuroxime or a source for a clinical effect size. Exact package scope: Oral cefuroxime axetil and oral magnesium hydroxide products with acid-neutralizing activity, including combination antacids. Milk of magnesia used as a laxative may require its own dose and schedule review.
Different medication preparation and nonclinical setting; abstract does not provide quantified results.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Replaces an unqualified absorption claim with the oral axetil/antacid condition and avoids extrapolating cefuroxime-sodium or cefpodoxime results. | |
| Research summary published |
Article revision: d38d141de26f684d
This guide brings together the evidence records used by our interaction checker. Each finding retains its own preparation limits, research date, and source summaries.
Full citations require verification. Reading this answer and the source summaries does not.
Taking other supplements or medications?
Use the checker to explore your other combinations. Ask a pharmacist to review the exact products, amounts and medical conditions in your complete list.
Open the interaction checkerInformation, not medical advice. Do not change prescribed treatment based on this guide.