Calcium phosphate

Calcium supplement
ALSO SOLD WITHOUT PRESCRIPTION

Calcium phosphate is a calcium supplement found in 1 medicine sold in India, such as Ostocalcium Plus. Below: what it is for, how it works, how to take it, side effects, interactions and pregnancy advice.

Also called: tribasic calcium phosphate

What it is used for

Provides calcium for bones and teeth.

How it works

A calcium supplement that also supplies phosphate, often used in syrups and children's products.

How to take it

Take as directed, usually with food.

Common side effects

  • Constipation
  • Stomach upset

Get medical help straight away if

Confusion, thirst or vomiting (too much calcium)

Be careful

Keep 2 to 4 hours apart from thyroid tablets and iron.

Other medicines and interactions

Same separation rules as other calcium: iron, levothyroxine, quinolones, tetracyclines.

Pregnancy and breastfeeding

Commonly used in pregnancy when prescribed.

Combination medicines that contain Calcium phosphate (1)

Ostocalcium Plus

Common questions

What is Calcium phosphate used for?

Provides calcium for bones and teeth.

How does Calcium phosphate work?

A calcium supplement that also supplies phosphate, often used in syrups and children's products.

How should I take Calcium phosphate?

Take as directed, usually with food.

What are the side effects of Calcium phosphate?

Common: Constipation, stomach upset. Get help straight away for: Confusion, thirst or vomiting (too much calcium).

Does Calcium phosphate interact with other medicines?

Same separation rules as other calcium: iron, levothyroxine, quinolones, tetracyclines.

Is Calcium phosphate safe in pregnancy and breastfeeding?

Commonly used in pregnancy when prescribed.

Does Calcium phosphate need a prescription in India?

It is usually sold without a prescription in India, but ask a pharmacist if you take other medicines or have a long-term illness.

Which brands contain Calcium phosphate?

Ostocalcium Plus.

Sources and further reading

NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.

Last reviewed 31 October 2026. Written by Satya Babu from standard prescribing information.

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For information only, not medical advice. This page is a plain-language summary written from standard prescribing information and the public guides linked below. Brands sometimes change their formula, so always check the composition printed on the pack. Doses here are typical adult doses; yours may differ. Do not start, stop or change a medicine without your doctor or pharmacist, and keep all medicines away from children. In an emergency, call 112 (India) or your local emergency number.