The short answer
Tolmetin’s label recommends antacids other than sodium bicarbonate. Ask your pharmacist about an alternative; an exact absorption change or protective spacing interval is not established.
What this answer covers
Sodium bicarbonate used as an oral antacid with tolmetin sodium capsules containing tolmetin-equivalent doses. Dietary bicarbonate and other antacids are separate.
- Supplement or preparation
- Sodium bicarbonate
- Medication ingredient
- tolmetin
The label names sodium bicarbonate specifically
For GI symptoms, the tolmetin label recommends antacids other than sodium bicarbonate. Ask the pharmacist to choose an appropriate option instead of assuming all antacids are interchangeable. The label does not provide a protective spacing interval.
A different antacid had different evidence
A crossover study tested aluminum and magnesium hydroxide with tolmetin sodium and found no meaningful change in most pharmacokinetic measures. That does not establish a similar result for sodium bicarbonate, which is a different ingredient.
Do not infer a precise absorption change
The inspected evidence does not establish how much sodium bicarbonate changes tolmetin levels or effectiveness. Findings involving tolfenamic acid, a different drug, cannot be used to supply that missing answer. Do not adjust the prescribed tolmetin dose to compensate for an assumed effect.
Persistent stomach symptoms need review
Antacids should not conceal persistent pain or possible bleeding during tolmetin treatment. Contact the prescriber about continuing symptoms and seek urgent care for vomiting blood or black, tarry stools. Review the reason for bicarbonate if it was medically prescribed.
Evidence and practical considerations
Absorption & effectiveness
The direction and extent of a sodium bicarbonate effect on tolmetin absorption are not established by the inspected evidence.
- Exact scope
- Sodium bicarbonate used as an oral antacid with tolmetin sodium capsules containing tolmetin-equivalent doses. Dietary bicarbonate and other antacids are separate. with Exact tolmetin IN 10636 linked by current RxNorm to tolmetin sodium PIN 42935. Capsules contain 246 mg sodium dihydrate equivalent to 200 mg tolmetin. Other NSAIDs are not interchangeable.
- Medication form and route
- Oral
What remains uncertain
- Original antacid trial tested aluminum/magnesium hydroxide, not sodium bicarbonate.
Factors that may matter: Exact preparation and dose; Fasting versus fed dosing; Bleeding and ulcer history; Other medicines.
Read the supporting source summaries
Source 1: Current prescribing information
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: Prescription oral oral tolmetin sodium capsules users; short human pharmacology studies where described.
Serious GI injury and bleeding warnings. Label recommends antacids other than sodium bicarbonate; aluminum/magnesium hydroxide did not change absorption in the cited study.
How this applies: Exact current product label. Exact tolmetin IN 10636 linked by current RxNorm to tolmetin sodium PIN 42935. Capsules contain 246 mg sodium dihydrate equivalent to 200 mg tolmetin. Other NSAIDs are not interchangeable.
Exact oral product label; no measured botanical co-use incidence. Ingredient, route, preparation and comparator differences must be retained.
Source 2: Original clinical research
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: 24 participants in a crossover pharmacokinetic study.
No meaningful change in most exposure, peak or clearance measures.
How this applies: Indirect for oral tolmetin sodium capsules co-use; exact preparation and endpoint retained.
Abstract-only. Not sodium bicarbonate; cannot transfer a null effect between antacid ingredients.
Source 3: Medication terminology
rxnav.nlm.nih.gov · Source check Sep 10, 2026
Population: Terminology.
tolmetin is IN. Exact tolmetin IN 10636 linked by current RxNorm to tolmetin sodium PIN 42935. Capsules contain 246 mg sodium dihydrate equivalent to 200 mg tolmetin. Other NSAIDs are not interchangeable.
How this applies: Exact identity.
Not clinical evidence.
Research assessment: · Open full citations ↗
Timing & monitoring
Choose an antacid other than sodium bicarbonate during tolmetin treatment unless the prescriber directs otherwise.
- Exact scope
- Sodium bicarbonate used as an oral antacid with tolmetin sodium capsules containing tolmetin-equivalent doses. Dietary bicarbonate and other antacids are separate. with Exact tolmetin IN 10636 linked by current RxNorm to tolmetin sodium PIN 42935. Capsules contain 246 mg sodium dihydrate equivalent to 200 mg tolmetin. Other NSAIDs are not interchangeable.
- Medication form and route
- Oral
What remains uncertain
- Exact label advises antacids other than sodium bicarbonate; no validated hours-apart solution or measured clinical event rate.
Factors that may matter: Exact preparation and dose; Fasting versus fed dosing; Bleeding and ulcer history; Other medicines.
Read the supporting source summaries
Source 1: Current prescribing information
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: Prescription oral oral tolmetin sodium capsules users; short human pharmacology studies where described.
Serious GI injury and bleeding warnings. Label recommends antacids other than sodium bicarbonate; aluminum/magnesium hydroxide did not change absorption in the cited study.
How this applies: Exact current product label. Exact tolmetin IN 10636 linked by current RxNorm to tolmetin sodium PIN 42935. Capsules contain 246 mg sodium dihydrate equivalent to 200 mg tolmetin. Other NSAIDs are not interchangeable.
Exact oral product label; no measured botanical co-use incidence. Ingredient, route, preparation and comparator differences must be retained.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Sources checked and article drafted. | |
| Research summary published |
Article revision: 562990fabc6af914
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.