Skip Ribbon Commands
Skip to main content


Drug Class: Commonly Known As: Category:
Vitamins and minerals Adult, Children

Calcium - What is it for

Calcium is a type of mineral naturally found in some foods that helps the body make strong bones and teeth. It is usually available in combination with Vitamin D, which helps with calcium absorption. Calcium and Vitamin D aid in osteoporosis and fracture prevention.

Calcium may also be used as a dietary supplement in individuals who are unable to obtain sufficient calcium in their regular diet, or in those who have an increased calcium needs, such as pregnant women, nursing mothers, children, and adolescents.

In chronic kidney disease (CKD), calcium salts are used to bind and reduce phosphate absorption from food. This in turn lowers phosphate levels in the body, thereby preventing the progression of bone disorder and other complications in CKD. 

View the following leaflets from National Kidney Foundation Singapore (NKFS) about how to manage phosphate levels:

Calcium - Side Effects, Precautions, and Contraindications

What side effects can Calcium cause?

  • Stomach upset, flatulence or bloating
    • You may reduce the stomach discomfort by taking medication with or after food
  • Constipation
    • Drink more water (unless you have water intake restriction or advised otherwise by your healthcare professional) and eat more high- fibre foods such as vegetables, fruits and whole grains

Speak to your doctor if the side effects do not go away.

The symptoms of a drug allergy include one or more of the following:

  • Swollen face/eyes/lips/tongue
  • Difficulty in breathing
  • Itchy skin rashes over your whole body

If you experience any of these symptoms, you should stop your medication and see your healthcare professional immediately.

Before taking Calcium , what precautions must I follow?

​Before starting on this medication, inform your healthcare professional if you:

  • Are allergic to this medication, or any of the other ingredients in this medication
  • Have a medical condition called Hypercalcemia where there is high calcium levels in the body
  • Have a medical condition called Hypercalciuria where there is excessive urinary clearance of calcium
  • Are experiencing chronic constipation
  • Are taking any other medications, including supplements, traditional medications and herbal remedies

What food or medicine must I avoid when I take Calcium ?

Space calcium supplements 2 hours apart from medications such as iron supplements, Levothyroxine and certain antibiotics (e.g. Quinolones - Ciprofloxacin, Tetracyclines). You may check with your healthcare professional for more information.

Calcium - Dosage and How to Use

How should Calcium be used?

  • Take this medication as prescribed by your healthcare professional
  • Do not stop taking your medications without checking with your healthcare professional
  • For Osteoporosis or as Calcium Supplementation:
    • Calcium carbonate or calcium phosphate tablets: This medicine should be taken after food for better absorption.
    • Calcium citrate, calcium lactate, calcium gluconate: You may take this medication with or without food.
  • For Chronic Kidney Disease (CKD):
    • Calcium carbonate: Chew or crush the tablets and take together with food at the beginning of a meal, for better results.

What should I do if I miss a dose?

​If you miss a dose, take the missed dose as soon as you remember. If it is almost time for your next dose, take only the usual dose. Do not double your dose or use extra medication to make up for the missed dose.

What should I do if I overdose?

Calcium - Handling

How should I handle Calcium safely?

Calcium - Storage

How should I store Calcium ?

;#Keep away from children;#Keep in a cool, dry place, away from direct sunlight;#Store at room temperature;#

Throw away all expired medications

How should I dispose of Calcium safely?

​Pack this medication into a black trash bag and seal it tightly before throwing into the rubbish chute or bin.

Calcium - Additional Information

  • Tags: Calcium, Calcium Carbonate
  • Updated on 12/31/2019 12:00:00 AM
  • Article contributed by PSS National Medication Information Workgroup PSS National Medication Information Workgroup
The information provided is not intended as medical advice. Terms of use. Information provided by SingHealth

Find Your Medicines