Breast feeding If you are breast feeding you should tell your doctor before you are given this medicine
Folic acid in very high doses can hide ongoing B12 deficiency
People who are at risk of vitamin B12 deficiency include: Older adults People with certain medical conditions, such as Crohn's disease, celiac disease, and pernicious anemia People who follow a vegan or vegetarian diet What Are the Benefits of B12 Shots
You should also contact your GP if: You are unable to attend scheduled maintenance injections, as missing doses can lead to symptom recurrence You develop new symptoms that might indicate other deficiencies or health problems You are planning pregnancy, as B12 requirements may change You experience persistent side effects such as headaches, dizziness, or gastrointestinal symptoms If you experience any side effects, talk to your doctor, pharmacist or nurse
The Typical Starting Dose of 1000 mcg (1 mg) The usual first dose for adults is 1000 mcg (1 mg) of vitamin B12