Pharmacy Guide
Patient leaflets and SmPCs, drug interaction checker, official dosages and NHS pharmacy opening hours — all in one place.
Pharmacy Guide
Patient leaflets and SmPCs, drug interaction checker, official dosages and NHS pharmacy opening hours — all in one place.
Cyanocobalamin 50 mcg Tablets
⚠ This medicine appears to have been discontinued
The electronic medicines compendium (emc) no longer publishes a Summary of Product Characteristics for this product, which usually means it is no longer marketed in the UK. The patient leaflet below is kept for reference, but the product may not be available.
If you were prescribed this medicine, other products containing Cyanocobalamin may still be available. Do not stop your treatment — ask your pharmacist or GP what to use instead.
What it is and what it is used for
for Cyanocobalamin Tablets contain cyanocobalamin, which is known as vitamin B 12. Vitamin B12 contains cobalt Most people get enough vitamin B12 from their food, but if you have had stomach surgery, or certain diseases of the intestines, or a restricted diet, you may not absorb enough vitamin B 12. Lack of vitamin B12 in the body causes a disease called pernicious anaemia (reduction in the number of red blood cells) which is often treated with vitamin B 12 injections. Cyanocobalamin tablets are used to treat vitamin B 12 deficiency when injections cannot be used.
What you need to know before you take it
e Cyanocobalamin Tablets take DO NOT take Cyanocobalamin Tablets:
- if you are allergic to cyanocobalamin or any of the other ingredients of this medicine (listed in section 6). Those who have an allergic reaction to Cyanocobalamin by injection are often able to take Cyanocobalamin Tablets without problems. Warnings and precautions: Talk to your doctor or pharmacist before taking Cyanocobalamin Tablets
If you have any other medical conditions, speak to your doctor before you take these tablets. Your doctor will want to monitor your response to this medicine carefully, particularly if you are young or elderly. This will probably involve regular examination of your blood every three months for 18 months and then annually. Talk to you doctor or nurse if you have a known cobalt allergy Other medicines and Cyanocobalamin Tablets Tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines. The absorption of Cyanocobalamin tablets may be affected by:
- Neomycin and chloramphenicol which are antibiotics
- Colchicine, a treatment for gout
- Biguanides, e.g. metformin, which are used to treat diabetes
- Cholestyramine which is used to reduce the amount of cholesterol (fats) in the blood
- Potassium chloride which is used to correct potassium deficiency
- Methyldopa which is used to treat high blood pressure
- Cimetidine which is used to treat excess acid in the stomach causing indigestion or ulcer
- Oral contraceptives Antibiotics (used to treat infections) and antimetabolites (used to treat some cancers) can affect the blood tests to measure vitamin B12. Cyanocobalamin Tablets with food, drink and alcohol Cyanocobalamin Tablets should be swallowed with water and taken between meals. Pregnancy, breast feeding and fertility If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before taking this medicine. As with all drugs Cyanocobalamin Tablets should only be given in pregnancy and when breast feeding if absolutely necessary. Cyanocobalamin Tablets contains lactose This medicine also contains lactose (which is a sugar). If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicinal product.
How to take it
Cyanocobalamin Tablets Always take this medicine exactly as described in this leaflet or as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure. Please read the label carefully, it will tell you how many Cyanocobalamin Tablets to take each day. The recommended dose is: Adults and Elderly: one to three tablets daily. Children: one tablet daily.
Cyanocobalamin Tablets should be swallowed with water and taken between meals. Do not stop taking this medicine, except on your doctor's advice. Your doctor may change the dose, depending on how you react to it. If you take more Cyanocobalamin Tablets than you should: If you accidentally take too much of this medicine, bring any remaining tablets and this leaflet with you to your doctor or pharmacist so that they know exactly what you have taken. If you forget to take Cyanocobalamin Tablets: If you miss a dose, take it as soon as you remember, if it is within a few hours of the normal time. Otherwise, leave out that dose completely and take your next dose at the normal time it is due. Do not take a double dose to make up for forgotten dose.
Possible side effects
Like all medicines, this medicine can cause side effects, although not everybody gets them. Allergic reactions to these tablets are rare but may show as an itchy rash. Very rarely, a severe allergic reaction may occur causing sudden onset of swelling of the face and neck, and shortness of breath. Acne-like and blister rashes have been reported rarely. If any of the side effects become serious, or if you notice any side effects not listed in this leaflet, please tell your doctor or pharmacist. Reporting of side effects If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store By reporting side effects you can help provide more information on the safety of this medicine.
How to store it
Cyanocobalamin Tablets Keep this medicine out of the sight and reach of children. Do not use Cyanocobalamin Tablets after the expiry date which is stated on label. The expiry date refers to the last day of that month. If your medicine is out of date, take it to your pharmacist who will get rid of it safely. Store below 25°C (room temperature). Store in the original container/package. Protect from light.
Contents of the pack and other information
What Cyanocobalamin tablets contains The active substance is cyanocobalamin. Each film coated tablet contains 50 micrograms cyanocobalamin. Cyanocobalamin Tablets also contains lactose, maize starch, magnesium stearate and purified water. The film coating includes polyvinyl alcohol, titanium dioxide, polyethylene glycol and talc. What Cyanocobalamin Tablets looks like and contents of pack The tablets are engraved 'Cytacon' on one face and plain on the reverse.
Cyanocobalamin Tablets are available in container packs of 50 Tablets. Marketing authorisation holder Mercury Pharma Group Ltd., Dashwood House, 69 Old Broad Street, London, EC2M 1QS, UK Manufacturer Skyepharma Production SAS, Zone Industrielle Chesnes Ouest, 55 Rue du Montmurier, Saint Quentin Fallavier, 38070, France. This leaflet was last revised in October 2025.
Frequently asked questions about Cyanocobalamin 50 mcg Tablets
How do I take Cyanocobalamin 50 mcg Tablets?
Cyanocobalamin 50 mcg Tablets comes as tablet containing 50mcg. Always follow the dose your doctor or pharmacist has given you, and read the leaflet that comes with the medicine.
What is the active substance in Cyanocobalamin 50 mcg Tablets?
The active substance in Cyanocobalamin 50 mcg Tablets is cyanocobalamin.
Are there equivalent medicines to Cyanocobalamin 50 mcg Tablets?
Medicines with the same active substance, strength and form include: Cyanocobalamin 50 micrograms Film-coated Tablets. They are interchangeable only if your prescriber or pharmacist says so.
Where does this information come from?
This leaflet reproduces the patient information leaflet approved for Cyanocobalamin 50 mcg Tablets, as published on the electronic medicines compendium (emc). The version printed inside your medicine’s packaging is the one that applies to you.
Can I get Cyanocobalamin 50 mcg Tablets without a prescription?
Whether a medicine is available over the counter or on prescription only depends on its licence. Check the leaflet, or ask your pharmacist — they can tell you straight away.
About this leaflet
The text above reproduces the patient information leaflet approved for this medicine, restructured for easier reading.
- Source: electronic medicines compendium (emc), Datapharm
- Active substance: cyanocobalamin
- Official document: view the original leaflet on emc →
⚕For healthcare professionals — Summary of Product Characteristics (SmPC)Full SmPC: dosage, interactions, contraindications, warnings+
4.1. Therapeutic indications
Recommended Clinical Indications:
Treatment of nutritional Vitamin B12 deficiency.
Treatment of vitamin B 12 deficiency following partial gastrectomy.
Treatment of tropical sprue, alone or with folic acid.
Treatment of pernicious anaemia when parenteral administration is not possible or not advised.
4.2. Posology and method of administration
Posology
Elderly:
The normal dose for adults is appropriate for the elderly.
Adults:
One to three tablets (50 to 150 micrograms) or more daily at the discretion of the physician.
In pernicious anaemia intramuscular therapy is preferable for initial correction of vitamin B12 deficiency. However, if necessary, the oral route may be used to follow this, in which case at least 300 micrograms should be given daily
Paediatric population:
One tablet (50 micrograms) daily at the discretion of the physician.
When possible, This medicine doses should be taken between meals.
Method of administration: Oral.
4.3. Contraindications
Hypersensitivity to the active substance or to any of the excipients listed in section 6.1.
Hypersensitivity to the product or any of the excipients.
4.4. Special warnings and precautions for use
For pernicious anaemia, an adequate dose must be used and the blood picture must be examined regularly at least every three months for 18 months until stabilised, and then annually.
Indiscriminate administration of this medicine may mask precise diagnosis.
Patients with rare hereditary problems of galactose intolerance, total lactase deficiency or glucose-galactose malabsorption should not take this medicine.
4.5. Interaction with other medicinal products and other forms of interaction
Absorption may be reduced by Para-aminosalicylic acid, colchinine, biguanides, neomycin, cholestyramine, potassium chloride, methyldopa, and cimetidine.
Patients treated with chloramphenicol may respond poorly to this medicine.
Serum levels of this medicine may be lowered by oral contraceptives. These interactions are unlikely to have clinical significance.
Anti-metabolities and most antibiotics invalidate vitamins B12 assays by microbiological techniques.
4.6. Fertility, pregnancy and lactation
Pregnancy
This medicine should not be used to treat megaloblastic anaemia of pregnancy because this is due to folate deficiency.
4.7. Effects on ability to drive and use machines
None.
4.8. Undesirable effects
Sensitisation to this medicine is rare, but may present as an itching exanthema, and exceptionally as anaphylactic shock.
Acneform and bullous eruptions have been reported rarely.
Patients who have become sensitised to this medicine by injection are often able to tolerate the oral route without trouble.
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.
4.9. Overdose
Overdosage is unlikely to require treatment.
💬 Ask about this leaflet
Ask anything about Cyanocobalamin 50 mcg Tablets. The assistant answers only from this leaflet — if the leaflet does not cover it, it will say so. It does not give medical advice.
Answers come from the patient leaflet published on the electronic medicines compendium (emc). They are not medical advice. Ask a pharmacist or your GP if you are unsure. For urgent help call NHS 111, or 999 in an emergency.