Cyanocobalamin - intramuscular

Patient Medicine Information
Why do I need this medicine?
Cyanocobalamin is used to treat pernicious anaemia, a decrease in the red blood cells which is caused by vitamin B12 deficiency.

Vitamin B12 is needed by the body to make red blood cells and not having enough of it can lead to pernicious anaemia.

Cyanocobalamin is also used to treat other vitamin B12 deficiency states.
How do I use this medicine?
Cyanocobalamin Intramuscular injection is to be injected slowly into the muscles, usually into the buttock muscles.

Your doctor or nurse will administer this injection for you.

Cyanocobalamin Intramuscular injection must not be injected intravenously.
What should I do if I have forgotten to use this medicine?
Ensure that you keep all appointments with your doctor so that you do not miss any doses.

DO NOT double a dose under any circumstances.
What should I take note of while using this medicine?
Inform your doctor if you have the following conditions:

- Leber's disease (inherited form of vision loss)
- polycythemia vera (bone marrow disorder)

Let your doctor know if you are pregnant or breastfeeding.

Keep your appointments with your doctor. Your doctor needs to monitor your condition and check your response to the medication regularly. He may also need to do routine blood tests while you are being treated with Cyanocobalamin.
What side effects could I experience?
Cyanocobalamin may cause dizziness. If affected, do not drive or take part in any activity in which you need to be alert.

Other side effects include any of the following: headache, nausea, diarrhoea, itching, rash, and feeling of swelling of the entire body.

Some side effects may need immediate medical help. Alert your doctor immediately quickly if you experience any of the following:

- pain and swelling in your arms and legs
- difficulty breathing, tiredness, numbness or tingling sensation in the hands and feet

Inform your doctor if any of these side effects do not go away or are severe, or if you experience other side effects.
Can I take this with other medicines?
Inform your doctor and pharmacist if you are taking any of these medicines:

- chlorampenicol (antibiotic)
- colchicine (medicine for gout)
- medicines for seizures (fits) e.g. phenobarbital, phenytoin

This list does not include all medicines that may interact with Cyanocobalamin.

Always notify your doctor and pharmacist if you are taking any other medicines, including herbal tonics, such as traditional Chinese medicine, supplements and medicines that you buy without a prescription.
What special dietary instructions should I follow?
Avoid alcohol.
How should I store this medicine?
Store in a cool, dry place away from the reach of children.

Medicines must not be used past the expiry date.
This information is independently developed by MIMS based on cyanocobalamin - intramuscular and is provided for your reference only. It is not a replacement for and should only be used in conjunction with full consultation with a licensed healthcare professional, the information provided by your pharmacist and/or the manufacturer of the medication. It may not contain all the available information you require and cannot substitute professional medical care, nor does it take into account all individual circumstances. Although great effort has been made to ensure content accuracy, we shall not be held responsible or liable for any claims or damages arising from the use or misuse of the information contained herein, its contents or omissions, or otherwise. Copyright © 2021 MIMS. All rights reserved. Powered by
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