For adults and children 12 and older, the standard dose is 2 to 4 Tums tablets chewed as symptoms occur. The exact maximum you can take in a day depends on the tablet strength, but the general ceiling for extra-strength tablets (750 mg each) is 9 tablets in 24 hours. You should not use the maximum dose for more than two weeks straight without a doctor’s guidance.
Dosing by Tablet Strength
Tums comes in several strengths, and the number of tablets you can safely take changes with each one. The active ingredient in every version is calcium carbonate, just in different amounts per tablet.
- Regular Strength (500 mg): Chew 2 to 4 tablets when symptoms hit. The daily max is higher here because each tablet delivers less calcium.
- Extra Strength (750 mg): Chew 2 to 4 tablets as needed, but do not exceed 9 tablets in a 24-hour period.
- Ultra Strength (1,000 mg): Chew 2 to 3 tablets per episode. The daily cap is lower, typically around 7 tablets, because each one packs more calcium.
Always check the label on the specific product you bought, since the per-dose and daily limits are printed right on the package.
How Tums Works
Tums neutralizes acid that’s already in your stomach rather than stopping your body from producing it. The calcium carbonate reacts directly with hydrochloric acid, raising the pH inside your stomach and reducing irritation. This also deactivates pepsin, a digestive enzyme that can aggravate an inflamed esophagus when it splashes upward. The relief is fast, usually within minutes, but it’s also relatively short-lived. Because Tums doesn’t prevent new acid from being produced, the effect typically lasts 30 to 60 minutes, which is why some people need to re-dose throughout the day.
How Long You Can Keep Taking Them
Tums is designed for occasional, short-term use. The label is clear: do not take the maximum dosage for more than two weeks, and do not keep taking Tums for symptoms that persist beyond two weeks without talking to a doctor. If you’re reaching for the bottle most days, that’s a signal your acid reflux may need a different approach, not just more antacids.
Dosing During Pregnancy
Heartburn is extremely common in pregnancy, and Tums is generally considered safe for expectant mothers when taken correctly. The typical recommendation during pregnancy is up to 2 regular-strength tablets (500 mg each) every 4 to 6 hours as needed. Pregnant women should not exceed 10 regular-strength tablets in 24 hours, and for extra-strength tablets, the limit drops to 6 in 24 hours. Sticking with regular strength is the most cautious option. Women with a history of calcium oxalate kidney stones should be especially careful, since the extra calcium load could be a problem.
Risks of Taking Too Many
A single extra tablet probably won’t cause harm, but routinely exceeding the recommended dose creates real risks. The most immediate issue is constipation, which is common even at normal doses. Beyond that, consistently overloading on calcium carbonate can push blood calcium levels too high, a condition that causes nausea, vomiting, confusion, and in serious cases, irregular heart rhythms.
The bigger concern with long-term overuse is kidney damage. Excess calcium can form kidney stones and impair kidney function over time. This pattern, sometimes called milk-alkali syndrome, is more likely with chronic overconsumption than with a one-time slip. It’s one of the main reasons the two-week limit exists on the label.
When Tums Aren’t Enough
If you’re using Tums more than a couple of times a week for several weeks running, your symptoms may have crossed from occasional heartburn into gastroesophageal reflux disease (GERD). GERD affects people who experience persistent acid reflux, and the symptoms go beyond the classic burning sensation behind the breastbone. Chronic cough, hoarseness, difficulty swallowing, nausea, or a feeling of stomach contents rising into your throat are all signs that something more is going on.
Tums can mask these symptoms without addressing the underlying cause. GERD often benefits from medications that reduce acid production rather than just neutralizing it after the fact, along with lifestyle changes like eating smaller meals, avoiding late-night eating, and elevating the head of your bed. If your reflux keeps coming back despite regular antacid use, that’s worth investigating rather than just increasing how many tablets you chew.