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Colextra-D3 20 000 IU capsules soft – patient leaflet, side effects, dosage

Medicine status: Prescription only (POM) Details

Medicine strength:
20 000 IU
Contains active substance:

Patient leaflet - Colextra-D3 20 000 IU capsules soft

2. what you need to know before you take colextra-d3 capsules

Do not take Colextra-D3 capsules:

  • If you are allergic (hypersensitive) to vitamin D or any of the other ingredients in the capsules (listed in Section 6)
  • If you have high levels of vitamin D in your blood (hypervitamino­sis D)
  • If you have high levels of calcium (hypercalcaemia) or high urine levels of calcium (hypercalciuria)
  • If you have kidney stones or serious kidney problems

Warnings and precautions

Check with your doctor before taking Colextra-D3 capsules:

  • If you have kidney damage or disease. Your doctor may want to measure the levels of calcium in your blood or urine
  • If you are being treated for heart disease
  • If you have sarcoidosis (an immune system disorder which may affect your liver, lungs, skin or lymph nodes)
  • If you are already taking additional doses of calcium or vitamin D. Whilst you are taking Colextra-D3 capsules your doctor will monitor you blood levels of calcium to make sure they are not too high

Children and adolescents

Do not give this medicine to children and adolescents under 12 years of age.

Other medicines and Colextra-D3 capsules

Tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines, including medicines obtained without a prescription.

In particular, the following medicines may interact with Colextra-D3 capsules:

  • Heart medicines (cardiac glycosides such as digoxin). Your doctor may monitor your heart with an electrocardiogram (ECG) and measure the levels of calcium in your blood
  • Thiazide diuretics (used to treat high blood pressure) reduce the urinary excretion of calcium and can increase the risk of hypercalcaemia
  • Medicines to treat epilepsy (such as phenytoin) or medicines to make you sleep (barbiturates such as phenobarbitone) as these medicines can decrease the effect of vitamin D
  • Glucocorticoids (steroid hormones such as hydrocortisone or prednisolone). These can decrease the effect of vitamin D
  • Laxatives (such as paraffin oil) or a cholesterol lowering drug called colestyramine may reduce the absorption of vitamin D
  • Actinomycin (a medicine used to treat some forms of cancer) and imidazole antifungals (medicines such as clotrimazole and ketoconazole used to treat fungal diseases) as they may interfere with the metabolism of vitamin D

3. how to take colextra-d3 capsules

Always take Colextra-D3 capsules exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.

(continued overleaf)

Facts about Colextra-D3 20 000 IU capsules soft

Prescription needed? Yes, prescription-only medicine (POM)
Active substance Colecalciferol
Strength 20 000 IU
Pharmaceutical form Oral capsule
How is it taken Oral
Pack sizes 10 capsule, 30 capsule
Is it available? Listed as available (NHS Dictionary of Medicines and Devices – not a record of current supplies)
Drug group (ATC)
  1. A Alimentary tract and metabolism drugs
    1. A11 Vitamins
      1. A11C Vitamin A and D, incl. combinations of the two
        1. A11CC Vitamin D and analogues
          1. A11CC05 colecalciferol
Codes GTIN 5060258391812, 5060258391829 · BNF 09060400

Sources: the NHS Dictionary of Medicines and Devices (dm+d), release 10.2.0 of 19 October 2026, NHS Business Services Authority. Contains public sector information licensed under the Open Government Licence v3.0.