Tums vs. Prevacid

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(Calcium Carbonate)


Relieves heartburn. Tums (Calcium Carbonate) gives quick relief for heartburn, but don't expect it to last all day.Treats heartburn and stomach ulcers. Prevacid (Lansoprazole) gives you long-lasting heartburn relief and helps heal ulcers.
How it works
Tums (Calcium Carbonate) is an antacid. It counteracts the effects of stomach acid to relieve heartburn and acid tummy (indigestion).Prevacid (Lansoprazole) is a proton pump inhibitor (PPI). It lowers the amount of acid in your stomach, treats heartburn, and heals ulcers.
Type of medication
Acid reducer
Proton pump inhibitor
Prescription or OTC
Available as
  • Chewable tablet
  • Liquid
  • Extended release
  • Dissolving tablet extended release
Used for (click to learn more)
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Reviews & ratings
Button Group. All currently active
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Reviews for Tums (Calcium Carbonate)
of people say Tums (Calcium Carbonate) is worth it
say it works well
say it's a big hassle
Side effects

We haven’t found good data for Tums side effects.

FDA side effect reports for Tums »
  • Diarrhea 2%
  • Abdominal pain 1%
More Prevacid side effects »
Risk factors for serious side effects
    • Current kidney disease
    • Kidney dialysis
    • Hyperparathyroid disease
    • Taking high doses of Vitamin D
    • Previous kidney stones
    Detailed Tums (Calcium Carbonate) risks & warnings »
      • Helicobacter pylori infection
      • Autoimmune disease
      • Being hospitalized
      • Antibiotic use
      • Osteoporosis
      • Age 50 or older
      • Using high medication doses
      • Long-term therapy (1 year or more)
      • Smoking
      • Use of other medications that weaken bones
        Detailed Prevacid (Lansoprazole) risks & warnings »
        Pregnancy category
        NFDA pregnancy category (Unknown)

        The FDA hasn’t classified this medicine’s effects on unborn babies. Talk with your doctor about this medicine if you’re pregnant or planning on it.

        See the FDA package insert
        BFDA pregnancy category (Probably safe)

        Research studies with animals haven’t found a risk to unborn babies, but it hasn’t been properly studied in humans.

        See the FDA package insert
        No specific alcohol-related info.No specific alcohol-related info.
        No specific food-related info.
        • Take Prevacid (Lansoprazole) about 1 hour before a meal.
        Kidneys and liver
        • People with kidney disease on dialysis may need to take a lower dose or avoid use. Your doctor can do blood tests to see if it's safe to use.
        • If you have kidney or hyperparathyroid disease Tums (Calcium Carbonate) can build up in your blood. This may can cause toxic levels of calcium in your body. This is more likely if you have severe kidney disease (defined as a kidney function blood test called GFR of less than 30ml/min). If you have severe kidney disease or are on kidney dialysis don't use Tums (Calcium Carbonate); a different antacid would be better for you.
        • Tums (Calcium Carbonate) contains calcium. Calcium can be an ingredient in some kidney stones. If you have had kidney stones in the past (especially the calcium-containing kind) be careful using Tums (Calcium Carbonate). Use the lowest dose for the shortest time possible or just play it safe and use a different antacid instead.
        No specific kidneys and liver-related info.
        No specific sex-related info.No specific sex-related info.
        No specific sleep-related info.No specific sleep-related info.
        No specific weight-related info.No specific weight-related info.
        Upsides and benefits
        • Works really fast.
        • Available over the counter without a prescription.
        • Cheap.
        • Most people can take Prevacid (Lansoprazole) without any noticeable day-to-day side effects.
        • Prevacid (Lansoprazole) lasts longer than other types of antacids (like Zantac, Pepcid, or Tums), and you only need to take it once or twice a day.
        • You can take it in combination with a quick-acting antacid (like Maalox or Tums) if you need relief right away.
        • Available as both a generic and over-the-counter option, so it's pretty affordable.
        • Sometimes if one PPI doesn't work, another medication in the same class will work for you.
        Downsides and risks
        • Doesn't last very long.
        • Other antacids like Zantac (H2 blockers) and omeprazole (proton pump inhibitors) can work better and last longer.
        • Some chalky aftertaste.
        • Doesn't start working as fast as some other antacids like Tums, Rolaids, or Maalox.
        • Depending on the condition you are treating, it can take one to two weeks to get the full effect.
        • If you are taking Prevacid (Lansoprazole) for a long time you should take a calcium supplement to prevent fragile bones.
        • Can interact with other drugs, so be sure your doctor knows all the medicine you're taking before starting Prevacid (Lansoprazole).
        Tips from our pharmacists for people taking the medication
        • Take at the first sign of discomfort.
        • You might need to take more than once a day but pay attention to the instructions on your bottle to avoid overdosing.
        • You need to separate Tums from some medications to avoid interactions.
        • If heartburn doesn't improve or lasts more than 2 weeks, talk to your doctor.
        • People with kidney disease on dialysis may need to take a lower dose or avoid use. Your doctor can do blood tests to see if it's safe to use.
        • Don't take if you have high blood calcium levels.
        • Take Prevacid (Lansoprazole) about 1 hour before a meal.
        • Don't chew or crush capsules, but swallow them whole.
        • If you have trouble swallowing, there's a tablet available that dissolves in your mouth.
        • Give Prevacid (Lansoprazole) a chance to work. You'll see some benefits right away, but the full effects can take a week or so to kick in.
        • Avoid drug interactions by telling your doctor all of the other medications or herbal supplements you take before starting Prevacid (Lansoprazole).
        Learn more
        More about TumsSide effectsReviews & ratingsAlternativesFDA package insert
        More about PrevacidSide effectsReviews & ratingsAlternativesFDA package insert