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Contact your GP if you experience: Unexpected symptoms after starting B12 supplementation, including persistent skin reactions, gastrointestinal disturbance, or mild allergic manifestations Neurological symptoms such as significant tingling, numbness, weakness, or balance problemsthese may indicate B12 deficiency paradoxically, or alternative neurological conditions requiring assessment Unexplained fatigue or malaise that develops or worsens despite supplementation Concerns about medication interactions , particularly if taking metformin, proton pump inhibitors, or other medications affecting B12 metabolism [2] [4] Seek emergency medical attention (call 999) if you develop signs of a severe allergic reaction following B12 injection, including facial swelling, difficulty breathing, or widespread urticaria
Treatment menu Treating vitamin B12 deficiency anaemia Vitamin B12 deficiency anaemia is usually treated with injections of vitamin B12, called hydroxocobalamin
Allow skin to air dry completely (alcohol must evaporate to prevent stinging)
Systemic side effects include mild nausea, transient headache, dizziness, and increased heart rate in some patients
