For the maintenance treatment of vitamin B12 deficiency, the usual dose is 100mcg SC/IM, given once per month
These extremely rare side effects include: Reactive thrombocytosis during the first week of use in megaloblastic anaemia Hypersensitivity reactions including: rash, itching, exanthema, antibodies to HYDR0XOCOBALAMIN-transcobalamin II Anaphylaxis Hypokalaemia Headache, paraesthesia, tremor Irregular heartbeat (arrhythmias secondary to hypokalaemia) Nausea Vomiting Diarrhoea Fever, chills, hot flushes, dizziness, malaise, pain and / or swelling at the injection site Acne Abnormal colouration of the urine (chromaturia) What should you not do after a B12 shot
Providers who offer injections to every patient without any lab work are operating on a wellness-mill model rather than a medically supervised one
Store reconstituted material refrigerated (28C) and use within ~4 weeks
These can make it hard for your body to get enough B12