MedicinePOM

Vitamin D3

Vitamin D supplement for preventing and treating deficiency.

Clinical information

Common uses

raising low vitamin D levels
daily supplement — low doses are safe

Common side effects

stomach pain
feeling sick
headache

Cautions

too much causes calcium build-up (hypercalcaemia)
call a doctor for vomiting, confusion, bone pain or irregular heartbeat
blood tests check vitamin D and calcium levels

Interactions

digoxin (calcium rise can upset heart rhythm)
thiazide-type diuretics (bendroflumethiazide, indapamide)
epilepsy medicines — phenytoin, carbamazepine, phenobarbital
cholestyramine and paraffin laxatives (absorption reduced)
steroids; ketoconazole; actinomycin

Pregnancy: recommended daily in pregnancy (400IU)

Reference information, not medical advice — always follow your doctor or pharmacist. Source: NHS Medicines A–Z, nhs.uk/medicines/colecalciferol (accessed 2026-08-16)

Approved brands & formulations2

Brand name	Dosage form	Strength	Importer	Category
Vitamin D3	Parenteral ( Injection )	600000 iu/ml	—	POM
Vitamin D3	Parenteral ( Injection )	300000 iu/ml	—	POM