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Vitamin B12 supplement

Cyanocobalamin

Brand names: Cytacon

Adult dose

Dose: Dietary deficiency: 50–150 micrograms PO OD between meals. (Pernicious anaemia: hydroxocobalamin IM is preferred)

Route: PO/IM

Frequency: OD

Clinical pearls

Dietary B12 deficiency in vegans/vegetarians
Use hydroxocobalamin IM for B12 deficiency due to malabsorption

Contraindications

Hypersensitivity

Side effects

Rare — itching, rash

Interactions

No clinically significant

Monitoring

FBC
B12 level
Reticulocyte response

Reference: BNF; NICE CKS; https://bnf.nice.org.uk/drugs/cyanocobalamin/. Verify against your local formulary and the latest BNF before prescribing.

Related

Curated clinical cross-links plus same-class fallbacks.

Pathways