Insufficiency can lead to fatigue and weight gain, and an injection of vitamin B12 can increase energy and help with gastrointestinal issues
Pregnancy, breastfeeding and cyanocobalamin
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
How Often Can You Give a B12 Injection
Before receiving folic acid or methylcobalamin, patients should be assessed for deficiency and appropriate therapy started concurrently