Colecalciferol

Vitamin D is produced naturally in your body when your skin is exposed to sunlight. Most people get enough vitamin D this way. A small amount of vitamin D comes from foods such as oily fish (salmon, mackerel, tuna), eggs, margarine and some milk. 

• In Aotearoa New Zealand, vitamin D levels are lowest during winter.
• Females tend to have lower vitamin D levels than males.
• People over the age of 70 years, particularly those in residential care, are exposed to less sunshine and have a reduced ability to make vitamin D.
• Māori and Pacific Peoples have lower levels of vitamin D than Pakeha or Europeans people.
• People with darker skin, such as Africans and Indians, are likely to have lower levels of vitamin D.
• Unhealthily overweight people have lower levels of vitamin D than others.

Most people don't have their vitamin D level checked and can start a vitamin D supplement safely without having a blood test. If you're at higher risk of being vitamin D deficient (not getting enough vitamin D), your healthcare provider will assess your risk and may prescribe colecalciferol. 

Read more about vitamin D and whether you need a vitamin D supplement.

Pregnancy

If you're pregnant and have a combination of risk factors for vitamin D deficiency (eg, being pregnant over winter, having darker skin and living in the South Island) it's recommended you have your vitamin D levels tested.

Read more about the risk of vitamin D deficiency in pregnancy and pregnancy and vitamin D.

• The usual dose of prescribed colecalciferol in adults is 1 capsule (1.25 mg) once a month.
• Another common way of measuring doses of vitamins is in international units (IU). 1.25 mg of vitamin D is the same as 50 000 international units (IU).
• You may be asked to take 2 capsules as your first dose, followed by 1 capsule every month after that.
• Some people who have very low vitamin D may need higher doses, such as 1 capsule once a day for 10 days, followed by 1 capsule every month thereafter. If you have deficiency from liver disease you may need to continue to take a capsule daily.
  
• Always take your colecalciferol exactly as your healthcare provider has told you. The pharmacy label on your medicine will tell you how much to take, how often to take it and any special instructions. 

• Take it regularly: If you have been advised to take colecalciferol once a month, choose a date that's easy for you to remember and mark it on the calendar, such as the first or last day of each month.
• Food: Colecalciferol can be taken with or without food.
• Missed dose: If you forget to take your dose, take it as soon as you remember, even if it's a few days later. But, if it's nearly the day for your next dose, just take the next dose on your usual day. Don't double the dose.

Here are some things to know when you're taking colecalciferol. Other things may be important as well, so ask your healthcare provider what you should know about.

• Peanut or soy allergy: Vit.D3 contains soya oil inside the capsule. Some people are allergic to soya oil and some people with peanut allergy also react to soya oil. The soft gelatin capsule should not be taken by people who are allergic to peanut or soya.
• Other medicines: Some health supplements, multivitamin products and calcium supplements may also contain vitamin D, so check with your healthcare provider or pharmacist before starting colecalciferol and before starting any new supplements.
• Calcium: Your healthcare provider may also advise you to have plenty of calcium in your diet. Good food sources of vitamin D are tuna, oily fish, eg, tuna, salmon and sardines, eggs, full-fat milk, yoghurt and cheese.
• Pregnancy or breastfeeding: Talk to your healthcare provider if you're pregnant, planning a pregnancy or want to breastfeed.
• Monitoring: You don't need to have your vitamin D levels checked while taking colecalciferol because it's safe to take without regular blood tests.

Like all medicines, colecalciferol can cause side effects, although not everyone gets them. 

Peanut and soy allergy

Colecalciferol soft gelatin capsules contain soybean oil. Some medicines containing soybean oil might cause an allergic reaction in patients with a peanut or soy allergy. If you have a peanut or soy allergy, ensure that your healthcare provider or pharmacist is aware of this and ask them to check your medicines. Learn more by reading the Medsafe safety information(external link).

Other side effects

Read more about medicines and side effects and reporting a reaction you think might be a side effect.