Calcium carbonate serves as a dietary addition utilized when the dietary intake of calcium falls short. The body requires calcium for the proper functioning of bones, muscles, the nervous system, and the heart. Additionally, calcium carbonate acts as an antacid, alleviating symptoms such as heartburn, acid indigestion, and stomach discomfort. This supplement can be obtained with or without a prescription.

Uses & Effectiveness?

  • Indigestion (dyspepsia): Calcium carbonate taken orally as an antacid is effective for relieving indigestion.
  • High potassium levels in the blood (hyperkalemia): Intravenous administration of calcium gluconate can reverse heart issues caused by elevated potassium levels. However, IV treatments must be administered by a healthcare professional.
  • Low calcium levels in the blood (hypocalcemia): Both oral and intravenous calcium are effective for treating and preventing low calcium levels. Again, IV treatments should be administered by a healthcare professional.
  • Kidney failure: Oral intake of calcium carbonate or calcium acetate helps manage high phosphate levels in the blood among individuals with kidney failure. Additionally, oral calcium intake appears to aid in reducing blood pressure in these patients.

Calcium during pregnancy

Calcium is indispensable during pregnancy. Your baby relies on calcium for robust bone and teeth development, a healthy heart, nerves, muscles, and the ability to maintain a regular heart rhythm and blood clotting functions.

While your calcium needs don’t escalate during pregnancy, they remain at your typical levels based on your age—1300 milligrams per day for women under 18 and 1000 milligrams per day for others. However, many women I encounter don’t consume sufficient calcium through their diet.

Besides supporting your baby’s growth, calcium plays a pivotal role in averting a condition known as pre-eclampsia, characterized by high blood pressure during pregnancy. This condition can pose significant risks to both you and your baby. Women with inadequate calcium intake (less than 600 milligrams per day) are at a heightened risk of developing pre-eclampsia, underscoring the importance of ensuring your calcium intake is adequate.

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Calcium supplements during pregnancy

Calcium supplements have been found to sometimes contain traces of lead, as reported in the U.S., where eight out of 23 nationally available calcium carbonate products were found to have small amounts of lead. While these amounts are minuscule, opting for calcium-rich foods is a safer choice. Not only that, but calcium from food is also absorbed more effectively compared to calcium from supplements. Good dietary sources of calcium include small, edible fish bones like those found in sardines, dairy products, and seeds such as sesame seeds. If you’re unsure about your calcium intake, consider keeping a food diary for a few days to track your calcium consumption, or consult with a prenatal dietitian for guidance.

If you do decide to take a calcium supplement, here are some recommendations to follow:

  • Do not exceed 500 milligrams of calcium per dose, as large doses may not be absorbed effectively.
  • Avoid taking calcium supplements simultaneously with your prenatal multivitamin, as it could interfere with the absorption of other nutrients like iron.
  • Calcium citrate is preferred as it is more readily absorbed, although it tends to be more expensive than other types of calcium supplements.
  • If you are using calcium carbonate supplements, take them with food to enhance absorption.
  • Keep in mind that the absorption of calcium from fortified beverages varies and is generally lower compared to calcium absorption from milk.

Pros and Cons of calcium carbonate


  • Effective Calcium Supplement
  • Bone Health
  • Antacid Properties
  • Availability
  • Affordability


  • Lead Contamination Risk
  • Digestive Side Effects
  • Absorption Issues
  • Interaction with Other Medications
  • Limited Elemental Calcium Content

Differences Between calcium carbonate and ranitidine

Calcium Carbonate:

It is mainly used as a dietary supplement to increase calcium intake and as an antacid to relieve symptoms of heartburn, indigestion, and upset stomach.


It is used primarily to decrease stomach acid production by blocking histamine-2 receptors, thereby reducing symptoms of gastroesophageal reflux disease (GERD), ulcers, and other acid-related conditions.

Alternative to calcium carbonate

Calcium Citrate:

This form of calcium is generally more easily absorbed by the body, especially for individuals with low stomach acid or those taking acid-reducing medications. It’s a good alternative for people who experience digestive issues with calcium carbonate.

What should I do if I forget a dose?

If you’re following a regular schedule of taking calcium carbonate, take the missed dose as soon as you remember. However, if it’s nearly time for your next scheduled dose, skip the missed one and continue with your usual dosing plan. Avoid taking a double dose to compensate for the missed one.

What should I do if I forget a dose?

Calcium carbonate can lead to certain side effects. Inform your doctor if any of these symptoms become severe or persist:

  • Upset stomach
  • Vomiting
  • Stomach pain
  • Belching
  • Constipation
  • Dry mouth
  • Increased urination
  • Loss of appetite
  • Metallic taste

Why is this medication prescribed?

Calcium carbonate is a dietary supplement utilized when the dietary intake of calcium falls short. The body requires calcium for maintaining healthy bones, muscles, the nervous system, and heart functions. Additionally, calcium carbonate serves as an antacid, alleviating symptoms such as heartburn, acid indigestion, and upset stomach. This supplement can be obtained over the counter or with a prescription.


In conclusion, the question of whether one can take calcium carbonate during pregnancy is multifaceted. Calcium is indeed an essential nutrient during pregnancy, crucial for the development of the baby’s bones, teeth, heart, nerves, and muscles. While calcium supplements like calcium carbonate can be beneficial for ensuring adequate intake, it’s important to consider potential risks such as lead contamination in some products. Moreover, obtaining calcium from dietary sources is generally safer and more easily absorbed by the body.

Ultimately, the decision to take calcium carbonate or any other supplement during pregnancy should be made in consultation with a healthcare provider. They can assess your individual needs, recommend appropriate doses or alternatives, and monitor for any potential side effects or complications. Prioritizing a balanced diet rich in calcium-rich foods like dairy products, fish, and seeds can also contribute significantly to meeting your calcium requirements during this crucial period.

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The information presented on this website is not intended as specific medical advice and is not a substitute for professional treatment or diagnosis. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.


My name is Wisdom Bassey, I'm a blog content writer and graphic designer who provides support and services for brands and different companies. I'm young and versatile, A tech enthusiast. I carry out deep research on every topic I choose to write about. You can reach me through my social media handles, I'm always available and ready to connect.

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