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B12 is delivered through an IV infusion by inserting a small catheter into a vein, allowing a saline-based solution containing vitamin B12 to flow directly into the bloodstream

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The deltoid muscle is located in the upper arm and is easily accessible for administration

Other reactions warranting urgent GP contact include: Unexplained muscle weakness or cramping Persistent vomiting or severe abdominal pain Signs of hypokalaemia (low potassium) during initial treatmentmuscle weakness, irregular heartbeat, or severe fatigue In patients with severe, longstanding B12 deficiency, rapid correction can occasionally precipitate hypokalaemia as new red blood cells are produced, consuming available potassium

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