The short answer
Mineral antacids that reduce acidity can increase amphetamine sulfate absorption or blood levels and may increase side effects. The effect depends on the antacid ingredients; the records do not establish a spacing interval that reliably prevents it.
What this answer covers
Applies to oral amphetamine sulfate and antacids that meaningfully reduce acidity; other heartburn medicines and mineral preparations are not interchangeable.
- Supplement or preparation
- Antacids
- Medication ingredient
- amphetamine sulfate
Evidence and practical considerations
Absorption & effectiveness
Exact labeling supports increased absorption or blood levels with alkalinizing agents, but not every mineral antacid is equivalent.
- Exact scope
- mineral-containing antacids with amphetamine sulfate
- Medication form and route
- oral amphetamine sulfate
- Timing or duration
- During use of a sufficiently alkalinizing antacid product.
What remains uncertain
Factors that may matter: exact antacid ingredients; dose and frequency; gastric or urinary pH effect.
Read the supporting source summaries
Source 1: current United States prescribing information
dailymed.nlm.nih.gov · Source check Jul 25, 2026
Population: Patients prescribed oral amphetamine sulfate.
Gastrointestinal alkalinizing agents increase absorption and urinary alkalinizing agents increase blood levels.
Label describes agent categories and does not quantify a universal supplement dose, timing interval, or absolute risk.
Research assessment: · Open full citations ↗
Side effects & toxicity
Exact labeling supports increased exposure with alkalinizing agents, but the mineral-antacid category is heterogeneous.
- Exact scope
- mineral-containing antacids with amphetamine sulfate
- Medication form and route
- oral amphetamine sulfate
- Timing or duration
- During use of a sufficiently alkalinizing product.
What remains uncertain
Factors that may matter: exact antacid ingredient; dose and frequency; amphetamine dose and cardiovascular risk.
Read the supporting source summaries
Source 1: current United States prescribing information
dailymed.nlm.nih.gov · Source check Jul 25, 2026
Population: Patients prescribed oral amphetamine sulfate.
Alkalinizing agents increase amphetamine absorption or blood levels.
Label describes agent categories and does not quantify a universal supplement dose, timing interval, or absolute risk.
Research assessment: · Open full citations ↗
Timing & monitoring
The label supports management of alkalinizing agents, not blanket avoidance of every mineral antacid.
- Exact scope
- mineral-containing antacids with amphetamine sulfate
- Medication form and route
- oral amphetamine sulfate
- Timing or duration
- During use of the relevant alkalinizing product.
What remains uncertain
Factors that may matter: exact ingredient and alkalinizing capacity; dose and frequency.
Read the supporting source summaries
Source 1: current United States prescribing information
dailymed.nlm.nih.gov · Source check Jul 25, 2026
Population: Patients prescribed oral amphetamine sulfate.
Alkalinizing agents increase amphetamine absorption or blood levels.
Label describes agent categories and does not quantify a universal supplement dose, timing interval, or absolute risk.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Research summary published |
Article revision: 7fbf3767bb116ff6
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.