Rolaids are an over-the-counter antacid used to relieve heartburn, sour stomach, and acid indigestion. They work by combining two active ingredients, calcium carbonate and magnesium hydroxide, which neutralize excess stomach acid on contact. Most people feel relief within minutes of chewing a tablet.
How Rolaids Work
Your stomach produces hydrochloric acid to break down food. Sometimes that acid splashes up into the esophagus (heartburn), or the stomach simply produces more than it needs (acid indigestion and sour stomach). Rolaids contain two compounds that are naturally alkaline, meaning they counteract acid the way baking soda neutralizes vinegar. Calcium carbonate does most of the heavy lifting, while magnesium hydroxide provides additional neutralizing power and helps balance out calcium’s tendency to cause constipation.
This dual-ingredient approach is what sets Rolaids apart from single-ingredient antacids. Calcium carbonate alone can slow digestion, while magnesium alone can have a laxative effect. Combining them reduces the likelihood of either problem.
Different Rolaids Products
Rolaids come in several strengths, each with different amounts of the same core ingredients:
- Original Strength: 675 mg calcium carbonate and 135 mg magnesium hydroxide per tablet
- Ultra Strength Tablets: 1,000 mg calcium carbonate and 200 mg magnesium hydroxide
- Ultra Strength Soft Chews: 1,330 mg calcium carbonate and 235 mg magnesium hydroxide
- Power Chews: 1,000 mg calcium carbonate only (no magnesium)
- Heartburn + Gas: 1,000 mg calcium carbonate, 200 mg magnesium hydroxide, plus 40 mg simethicone to help break up gas bubbles
If your discomfort involves bloating or gas alongside heartburn, the Heartburn + Gas version adds simethicone, which breaks apart trapped gas bubbles in the digestive tract. It doesn’t reduce acid any more effectively than the other formulas, but it targets that uncomfortable pressure feeling.
How to Take Them Safely
Rolaids are chewable tablets you take as symptoms appear. For the Ultra Strength version, the label limits use to no more than 7 tablets in a 24-hour period, and you should not use the maximum dosage for more than 2 weeks straight. These limits exist because consistently high intake of calcium and magnesium can strain your kidneys and throw off your body’s mineral balance.
If you’re reaching for Rolaids daily for more than two weeks, the heartburn likely has an underlying cause that an antacid won’t fix, such as gastroesophageal reflux disease (GERD), a hiatal hernia, or a medication side effect. Persistent heartburn deserves a closer look from a healthcare provider rather than ongoing antacid use.
Interactions With Other Medications
Antacids like Rolaids can interfere with how your body absorbs other medications. The calcium and magnesium can bind to certain drugs in the stomach, reducing the amount that actually enters your bloodstream. A good rule of thumb: take other medications at least one hour before or four hours after taking Rolaids to avoid this problem. This is especially important for antibiotics, thyroid medications, and heart drugs, though many other prescriptions can be affected too.
If you take any prescription medications regularly, check with your pharmacist before adding Rolaids to your routine. The interaction isn’t dangerous in most cases, but it can make your other medications less effective without you realizing it.
Safety During Pregnancy
Heartburn is extremely common during pregnancy, particularly in the second and third trimesters, as the growing uterus pushes stomach contents upward. Calcium- and magnesium-based antacids like Rolaids are generally considered safe at recommended doses during pregnancy, and some experts actually prefer them over aluminum-based alternatives. The calcium in Rolaids also provides a small supplemental benefit, since adequate calcium intake during pregnancy may help prevent high blood pressure and preeclampsia.
That said, long-term use at high doses of any antacid during pregnancy warrants a conversation with your provider. The key is sticking to the recommended amounts and using them for symptom relief rather than as a daily preventive.
Rolaids vs. Other Antacids
Rolaids occupy the same category as Tums (calcium carbonate only) and Maalox (aluminum and magnesium). The practical differences are modest. Tums lacks the magnesium component, so it’s slightly more likely to cause constipation with regular use. Aluminum-based antacids are less preferred during pregnancy. Rolaids’ calcium-magnesium combination hits a middle ground that works for most people.
All of these are fundamentally different from acid reducers like famotidine (Pepcid) or omeprazole (Prilosec), which reduce acid production over hours or days rather than neutralizing acid already in the stomach. Antacids are faster but shorter-lasting. If you need relief right now, an antacid like Rolaids works within minutes. If you need all-day prevention, an acid reducer is the better tool.