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) B12 injections work quickly
Boost Your Energy: Personalized B12 Injections with Janet Beres, PA-C What are the symptoms of B12 deficiency
Hydroxocobalamin: Professional patient advice
Alcohol and certain medications like colchicine can also interact with B12, so we'll review all your medications and supplements before starting treatment
Studies of other GLP-1 receptor agonists provide relevant context