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What does it do?

Alfacalcidol is a type of vitamin D. It increases the amount of vitamin D in your body.

Before you start

  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.

How should you take it?

Take alfacalcidol regularly as directed. You can take it with or without food.
Capsule: Take with a glass of water.
Liquid: Do not shake the bottle. Measure carefully using the dropper provided.

What if you forget a dose?

If it is nearly time for your next dose, skip the missed dose and take your next dose at the usual time. Otherwise, take the missed dose as soon as you remember. Do not take two doses at the same time.

Can you take other medicines?

Some medicines available without a prescription may react with alfacalcidol including:

  • products that also contain vitamin D (e.g. Centrum®)

Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products or recreational drugs.

What side effects might you notice?

Side EffectsRecommended action

Symptoms of too much vitamin D including: vomiting, headache, trouble thinking clearly or concentrating, weakness, peeing more often

Tell your doctor

If you notice any other effects, discuss them with your doctor or pharmacist.

Other information:

  • You need enough calcium in your diet to make sure alfacalcidol works properly for you. Discuss with your health professional.
  • Store alfacalcidol drops in the fridge. They expire 4 months after opening. If you have any drops leftover after this time, take it back to your pharmacy.

This leaflet contains important, but not all, information about this medicine.

Prepared by the MyMedicines Committee at Christchurch Hospital, Te Whatu Ora - Waitaha, New Zealand. August 2026

For more general information about this sheet and its contents, see: What does a My Medicines sheet cover?

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About My Medicines

My Medicines Patient Information Leaflets (PILs) contain important, but not all, information about the medicines they describe.

For more information about the sheets, see: What does a My Medicines sheet cover?

My Medicines is developed by a team at Te Whatu Ora – Waitaha. Our team is made up of doctors, pharmacists, and a non-medical person to help us keep to plain language. We also discuss our information with specialist health professionals or groups when needed