The short answer
Magnesium can matter when it is taken as an antacid that raises stomach pH. Take atazanavir two hours before or one hour after an antacid or buffered medicine.
What this answer covers
Oral atazanavir with magnesium products that neutralize stomach acid. A nutrient name alone does not identify an antacid or establish its acid-neutralizing effect.
- Supplement or preparation
- Magnesium
- Medication ingredient
- atazanavir
Check the exact medicine and regimen
This review concerns oral atazanavir, supplied as atazanavir sulfate in products such as REYATAZ. Capsule and powder instructions and the use of a booster must match the prescription. An unboosted study does not establish the same exposure change in every boosted combination.
Identify an antacid before applying the rule
The concern is reduced drug availability when stomach acidity is lowered. The atazanavir label applies the rule to antacids and buffered medicines. A different mineral salt used for nutrition is not automatically equivalent, and the label on the actual product matters.
Keep the dosing order clear
Take atazanavir two hours before or one hour after an antacid or buffered medicine. Ask the pharmacist to place the antacid, meals and the complete prescription on one schedule. Do not substitute this rule for proton-pump inhibitor or H2-blocker instructions; those products can have different restrictions.
Understand what the evidence does not prove
A human study found much lower unboosted atazanavir exposure with a proton-pump inhibitor. That supports acidity sensitivity, but does not supply an antacid effect size or a schedule for every boosted regimen.
Evidence and practical considerations
Timing & monitoring
The exact oral label supports an acid-neutralizing product precaution and a directional schedule, not a blanket interaction with every form of this mineral.
- Exact scope
- Oral atazanavir with magnesium products that neutralize stomach acid. A nutrient name alone does not identify an antacid or establish its acid-neutralizing effect. with RxNorm 343047 IN atazanavir. REYATAZ sulfate capsules/powder with base-equivalent strengths; boosted and unboosted regimens explicitly differ. Other protease inhibitors not treated as equivalent.
- Medication form and route
- Oral
What remains uncertain
- Preparation-specific oral acidity precaution, not a blanket cation-chelation claim. Direction of dosing order retained; no transfer to topical/injected formulations or other acid-reducer classes.
Factors that may matter: Exact oral regimen and formulation; Booster or fixed-combination context; Mineral preparation and dosing order; Food requirements.
Read the supporting source summaries
Source 1: Current original prescribing information
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: Patients prescribed the specified oral regimen.
Administer atazanavir two hours before or one hour after antacids/buffered medicines. Hypericum contraindicated; gastric acidity and CYP3A susceptibility matter.
How this applies: RxNorm 343047 IN atazanavir. REYATAZ sulfate capsules/powder with base-equivalent strengths; boosted and unboosted regimens explicitly differ. Other protease inhibitors not treated as equivalent.
High-dose PPI research is not an antacid effect size. Garlic studies with other protease inhibitors and target inaccessible case remain distinguished.
Source 2: Original clinical research
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: Ten healthy volunteers enrolled; nine completed crossover.
Acid suppression markedly reduced exposure.
How this applies: Exact reported regimen, preparation and endpoints only; other drugs or forms remain indirect.
Abstract-only high-dose proton-pump inhibitor experiment, not mineral antacid or boosted-regimen effect size; exact label supplies the antacid interval.
Source 3: Medication terminology
rxnav.nlm.nih.gov · Source check Sep 10, 2026
Population: Terminology.
atazanavir is IN.
How this applies: Exact ingredient.
Not clinical evidence.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Research summary published | |
| Article prepared | |
| Sources checked and article drafted. |
Article revision: 879421299e3315a9
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.