The short answer
Mineral antacids that reduce acidity can increase dextroamphetamine 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. Discuss the exact product with the prescriber before use; the cited guidance advises avoiding relevant gastrointestinal alkalinizing antacids.
What this answer covers
Applies to oral dextroamphetamine and antacids that meaningfully reduce acidity; other heartburn medicines and mineral preparations are not interchangeable.
- Supplement or preparation
- Antacids
- Medication ingredient
- dextroamphetamine
Evidence and practical considerations
Absorption & effectiveness
Exact-dextroamphetamine sources identify antacids, and labeling supports increased exposure from gastrointestinal alkalinization; the conclusion is conditional because the category is chemically heterogeneous.
- Exact scope
- mineral-containing antacid products with dextroamphetamine
- Medication form and route
- oral dextroamphetamine
- Timing or duration
- Relevant when the specific product meaningfully alkalinizes the gastrointestinal tract or urine.
What remains uncertain
- Calcium carbonate, magnesium hydroxide, aluminum hydroxide, sodium bicarbonate, proton-pump inhibitors, and H2 blockers are not interchangeable.
- No universal magnitude was established for all mineral antacids.
- Only the alkalinizing mechanism is retained.
Factors that may matter: antacid ingredient; dose; timing; formulation; urinary pH; renal function.
Read the supporting source summaries
Source 1: United States government drug information
medlineplus.gov · Source check Jul 24, 2026
Population: Patients taking exact dextroamphetamine.
Antacids are explicitly listed.
The page does not distinguish mineral antacids from other acid-suppressing products.
Source 2: United States prescribing information
dailymed.nlm.nih.gov · Source check Jul 24, 2026
Population: Patients receiving oral dextroamphetamine sulfate.
Antacids are named, and gastrointestinal alkalinizing agents are described as increasing amphetamine absorption and exposure.
Product-specific magnitude is not established.
Research assessment: · Open full citations ↗
Side effects & toxicity
Regulatory and exact-dextroamphetamine sources support exposure increase from alkalinizing antacids; toxicity relevance is conditional on the actual product and patient.
- Exact scope
- mineral-containing antacid products with dextroamphetamine
- Medication form and route
- oral dextroamphetamine
- Timing or duration
- Relevant while a specific antacid produces clinically meaningful alkalinization.
What remains uncertain
- Antacids are chemically heterogeneous; only meaningful alkalinizing products are retained.
- No controlled exact-pair toxicity incidence was found.
- Intrinsic antacid adverse effects are not part of this endpoint.
Factors that may matter: antacid ingredient and dose; formulation; renal function; cardiovascular disease; psychiatric vulnerability; higher stimulant dose.
Read the supporting source summaries
Source 1: United States prescribing information
dailymed.nlm.nih.gov · Source check Jul 24, 2026
Population: Patients receiving oral dextroamphetamine sulfate.
Antacids are named, and gastrointestinal alkalinizing agents are described as increasing exposure.
No product-specific toxicity incidence.
Source 2: United States government drug information
medlineplus.gov · Source check Jul 24, 2026
Population: Patients taking exact dextroamphetamine.
Antacids are named as interacting products requiring discussion.
No effect magnitude or individual antacid ingredient is specified.
Research assessment: · Open full citations ↗
Timing & monitoring
Direct exact-dextroamphetamine disclosure guidance plus regulatory avoidance language support management, conditional on the antacid ingredient.
- Exact scope
- mineral-containing antacid products with dextroamphetamine
- Medication form and route
- oral dextroamphetamine
- Timing or duration
- During use of the specific alkalinizing antacid; no universal timing interval is established.
What remains uncertain
- Not every heartburn product is a mineral antacid or alkalinizing agent.
- No universal time separation was validated.
- Product ingredient must be known before applying the rule.
Factors that may matter: antacid ingredient; dose; timing; formulation; renal function; cardiovascular vulnerability.
Read the supporting source summaries
Source 1: United States government drug information
medlineplus.gov · Source check Jul 24, 2026
Population: Patients taking exact dextroamphetamine.
Antacids are explicitly named.
No product differentiation or interval.
Source 2: United States prescribing information
dailymed.nlm.nih.gov · Source check Jul 24, 2026
Population: Patients receiving oral dextroamphetamine sulfate.
Gastrointestinal alkalinizing agents such as antacids should be avoided because they increase exposure.
Applies only when the product is meaningfully alkalinizing.
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: 1883e3344b049e16
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.