Warnings and Precautions Hypokalemia: B12 therapy may cause a drop in potassium levels (hypokalemia), particularly during early treatment in patients with significant B12 deficiency
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What are the benefits of B12 (Methylcobalamin)
B12 injections should be avoided during pregnancy, breastfeeding, or if you plan to become pregnant or breastfeed soon
Lab follow-up helps show whether the schedule is correcting deficiency and whether ongoing maintenance is needed
Common reactions may include pain, redness, or irritation at the injection site, mild diarrhea, nausea, itching, headache, dizziness, or a general feeling of swelling