what happens if you don't get your b12 injection Do Need a Prescription for Injections? Vitamin B12 Deficiency - Harvard

Intramuscular therapy leads to more rapid improvement and should be considered in patients with severe deficiency or severe neurologic symptoms

Do not stop prescribed medicines or supplements without professional guidance

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They start with high doses to fill up their vitamin B12 stores

And in the 80s it increased to every three months, which is still what they use today

Route of Administration: Given through IV (intravenous) or IM (intramuscular) injection Methylcobalamin Injection (B12) FAQs Doctors may stop B12 injections if a patients levels are stabilized, if they switch to oral supplements, or if there's no clear deficiency