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10.1159/000093982 104 SevenA.CivelekS.InciE.InciF.KorkutN.BurcakG
Patients can usually return to their regular activities immediately afterward
Summary: Feeling worse after a B12 injection typically reflects your body adjusting to replenished vitamin levels, triggering metabolic processes that may temporarily cause fatigue, headaches, or injection site discomfort
In post-marketing experience, angioedema and angioedema-like reactions were reported with parenteral methylcobalamin
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