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Fultium D3

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Delivery and Packing
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We deliver medications between Monday and Saturday. You can upgrade to Saturday delivery on Friday.

My Order Hasn’t Arrived What Should I Do?

You should receive a tracking number with your order which you can use this number to track your parcel online. This should give you a clear indication of where your parcel is. If you haven’t received your parcel in the time frame given by our couriers, contact your local depot to find out where it is. You can also contact our support team who will do this for you.

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You can pay for your order using credit, debit card and bank transfer.

Card Payment: Please notify us that you wish to cancel your order. Your refund will show available In 1 - 3 days.

Bank Transfer: A member of our team will contact you requesting for your bank details. These details are only used to transfer the funds back into your account.

Treatment Information

Table of contents

Patient Reviews: How Fultium D3 Has Made a Difference

What is Fultium D3?

Fultium D3 is a vitamin D supplement available in capsule form. It is prescribed to treat or prevent vitamin D deficiency.

Deficiency of vitamin D can occur when your diet or lifestyle does not provide you enough vitamin D or when your body requires more vitamin D than usual, e.g. if you are pregnant.

Fultium D3 may also be prescribed for certain bone conditions, such as thinning of the bone (osteoporosis) when it will be given to you alongside other medication.

Looking to renew your prescription for Fultium D3? With Prescription Doctor's convenient online pharmacy, you can safely buy Fultium D3 following a short online medical consultation. Simply complete our online questionnaire for our doctor to determine whether the treatment is suitable for you.

If your order is approved by our doctor before 3pm, Monday to Friday, our UK based pharmacy will dispatch your item the same day via a fast and discreet next-day delivery service.

How Does Fultium D3 Work?

Fultium D3 contains the active ingredient cholecalciferol, also known as vitamin D. It increases the amount of vitamin D in the body, contributing to the maintenance of bones and muscles, as well as helping the immune system.

Most vitamin D is acquired from the sun or fortified foods

Our body creates vitamin D from exposure to direct sunlight on the skin when outdoors. Vitamin D is also available from some foods such as:

  • Oily fish (e.g. Salmon, sardines)
  • Red meat
  • Egg yolks
  • Fortified cereals and dairy products

A deficiency in vitamin D develops when there is a lack of vitamin D in the body. This can be the result of inadequate exposure to sunlight, whether due to the less amount of sunlight during the winter months or spending a lot of time indoors. Without the right amount of exposure to the sun, cells in the skin cannot convert cholesterol into vitamin D.

With more people now staying indoors due to Coronavirus (Covid-19), they may be deprived of vitamin D a lot more than usual. The NHS have advised people should consider taking 10 micrograms of vitamin D a day if they are spending a lot of their time indoors.

While vitamin D itself cannot categorically prevent or treat Covid-19, ensuring you eat a healthy, balanced and varied diet is important for your immune system and helps it fight infections. You can watch the video below from the British Nutrition Foundation for more about the relationship between diet and immunity against the novel coronavirus.

Supplements such as Fultium D3 can help to provide our bodies with the right amount of vitamin D.

Vitamin D is important for the body to absorb calcium from the gut and a vitamin D deficiency can lead to low calcium levels and the weakening of the bones, known as osteomalacia.

You can safely buy Fultium D3 online from Prescription Doctor, however you always consult your doctor before purchasing any medication online.

How Do I Take Fultium D3?

Always follow your doctor’s instructions on how to take Fultium D3. The number of capsules you take each day will depend on the severity of your vitamin D deficiency.

Typically, Fultium D is taken once a day, unless instructed otherwise by your doctor.

You take Fultium D capsules by swallowing them whole with a drink of water. Fultium D capsules can be taken with or without food.

Do not open, crush, or chew the capsule.

Your doctor will monitor how you respond to the treatment over time and adjust your dose accordingly.

Side effects and cautions of Fultium D3

Before you take any medicine prescribed to you, it's important to familiarise yourself with the information found inside the enclosed patient information leaflet. This leaflet contains important information on how to take Fultium D3, as well as a complete list of side effects and contraindications.

Who should not take Fultium D3?

Fultium D3 is not suitable for everyone. If you are unsure whether it is safe for you to take Fultium D3, speak to your doctor. They will be able to assess your medical history, including other medicine you may be taking, and advise whether Fultium D3 is suitable for you.

Do not take Fultium D3 if you:

  • are allergic to any of the ingredients listed in the patient information leaflet
  • have high levels of vitamin D in your blood (hypervitaminosis D)
  • have high levels of calcium in your blood (hypercalcaemia)
  • have high levels of calcium in your urine (hypercalciuria)
  • have kidney stones or serious problems with your kidneys

Side effects

All medicines carry the risk of side effects, though not everybody experiences them. It's important to remain vigilant of side effects throughout your course of treatment with Fultium D3.

Common or very common (may affect more than 1 in 10 people):

  • Abdominal pain
  • Headache
  • Nausea

Uncommon side effects (may affect fewer than 1 in 100 people):

  • Constipation
  • Decreased appetite
  • High levels of calcium in the blood (hypercalcaemia)
  • High levels of calcium in your urine (hypercalciuria)
  • Thirst
  • Vomiting

Rare side effects (may affect fewer than 1 in 1,000 people):

  • Hives
  • Itching
  • Skin rash

This is not a complete list of side effects. Further information regarding the safety of Fultium D3, including a complete list of side effects, can be found within the leaflet enclosed with your medicine.

If you experience any side effects, regardless of whether they are listed above or in the patient information leaflet, inform your doctor or speak to a pharmacist for assistance.


Do not take Fultium D3 if you are allergic to cholecalciferol or any of the other ingredients listed in the enclosed leaflet.

If you experience the signs of an allergic reaction, stop taking Fultium D3 and seek immediate medical attention by going straight to your nearest accident and emergency department. Remember to take the packaging and any remaining medicine with you so that doctor's know exactly what and how much you took.

Signs of an allergic reaction include:

  • Chest tightening
  • Dry, red and cracked skin
  • Itchy, red watery eyes
  • Raised, itchy, red rash (hives)
  • Swelling of the lips, tongue, eyes or face
  • Tummy pain, nausea, vomiting or diarrhoea
  • Wheezing

Pregnancy and breastfeeding

If you are pregnant, think you might be pregnant, plan on becoming pregnant or breastfeeding, speak to your doctor before taking Fultium D3.

It is recommended by the NHS to take a vitamin D supplement during pregnancy and breastfeeding to ensure you and your child receive the adequate amount of vitamin D your bodies need.

If you are pregnant or breastfeeding, you should always speak to your doctor before taking any vitamin supplements to ensure they are safe for you and your baby.

Other safety information

Always speak to your doctor before you buy Fultium D3 online from Prescription Doctor.

Please inform our doctor of all other medicines you are currently taking, including those bought over the counter, prescribed by your doctor, as well as health and herbal supplements.

Do not take Fultium D3 past the expiry date printed on the packaging. The date refers to the last day of the specified month. For example, "EXP: 03/2025" means the 31st of March 2025.

Never throw medicine away via household or water waste. Take any unwanted or expired medicine to your local pharmacy and ask them to dispose of them safely on your behalf.

Always store your medicine out of sight and reach from children and pets.

Never share your medicine with anybody else, even if they have the same symptoms or have been diagnosed with the same condition as you.

Frequently Asked Questions

What should I do if I forget to take Fultium D3 when I should?

If you forget to take Fultium D3 when you should, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and take your next dose of Fultium D3 at the usual time. Do not take more Fultium D3 to make up for the missed dose.

What should I do if I take too much Fultium D3?

If you take one capsule too many, it is unlikely to cause you harm. However, if you several capsules too many then you must inform your doctor right away or seek other medical attention. Take the leaflet and any remaining medicine with you so doctors know exactly what you have taken. If you take too many capsules you can feel or be sick, become constipated or have stomach pains, weak muscles, tiredness, lack of appetite, kidney problems and in severe cases irregular heartbeats.

Can I drink alcohol while taking Fultium D3?

It is unlikely that alcohol will affect Fultium D3 capsules however, it is recommended not to drink more than 14 units of alcohol per week.

Will Fultium D3 impact my ability to drive or operate machinery?

Fultium D3 should not impact your ability to drive or operate machinery.

Can I buy Fulcium D3 over the counter in the UK?

Fultium D3 is only available on prescription in the UK and cannot be bought over the counter.

How much vitamin D do I need per day?

Approximately 10 mcg (400 IU) of vitamin D is sufficient for most people.

When should I take vitamin D supplements?

Vitamin D supplements can be taken any time of the day. To help you remember when to take them, set a reminder on your phone or work them into your daily routine by taking them with breakfast for example.

Does sunscreen affect how much vitamin D we get from the sun?

The British Association of Dermatologists (BAD) say that it's unlikely using sunscreen will have a detrimental affect on your skin's ability to produce vitamin D. If you are spending time out in the sun for long periods, you should apply a liberal amount of sunscreen to protect your skin.

Can vitamin D supplements prevent or treat Covid-19?

This is a lack of evidence to suggest vitamin D can treat or prevent Covid-19, according to NICE.


NHS, 2020. Vitamins and minerals: Vitamin D

BAD, 2013. Vitamin D and the Sun

Internis Pharmaceuticals Ltd, 2018. Fultium-D3 800IU capsules: Summary of Product Characteristics

Treatment information

  • Product Name: Fultium D3
  • Manufacturer: Internis Pharmaceuticals Ltd
  • Active Ingredient(s): Colecalciferol
  • Administration: Oral
  • Presentation: Capsules
  • Available Strength: 800IU, 3200IU, 20,000IU
  • Exemption: Prescription Only Medicine
  • Dosage: Take as prescribed by your doctor
  • Description: Fultium D3 is a prescription-only vitamin supplement which is used to treat vitamin D deficiency.
  • Drug Class: Vitamin
  • Alcohol Consumption: No influence
  • When Pregnant: Speak to your doctor before taking Fultium D3 if you are pregnant
  • When Breastfeeding: Speak to your doctor before taking Fultium D3 if you are breatfeeding
  • Price: 14.99 GBP
Click here to view the Fultium D3 - Patient Information Leaflet

Authored & Reviewed By

Mohamed Imran Lakhi

Mohamed Imran Lakhi

MPharm - Lead Pharmacist
Imran Lakhi is the superintendent pharmacist and founder at Prescription Doctor. He has been at the core of our team.

Published on: 16/10/2020 Reviewed on: 13/03/2024

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