side effects to b12 injections How Long Does a Shot Last? Neurological findings in B12 deficiency

Treatment The injection is quick, and most people feel little to no pain

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Patients should seek emergency medical help (call 999) if they experience: Difficulty breathing, wheezing, or throat tightness Swelling of the face, lips, tongue, or throat (angioedema) Widespread urticarial rash (hives) developing rapidly Dizziness, fainting, or rapid heartbeat suggesting anaphylaxis These symptoms typically occur within minutes to hours of administration, most commonly with injectable preparations

In cats, deficiencies are often linked to gastrointestinal disease, especially inflammatory bowel disease and lymphoma