Common side effects include, but may not be limited to: pain or redness at the injection site mild diarrhea pruritus (itching) increased swelling joint pain dizziness headache nervousness or anxiety Serious side effects may include: allergic reactions peripheral vascular thrombosis hypokalemia (low potassium levels) pulmonary edema (fluid build-up around or in the lungs) thrombocytosis congestive heart failure There have been reports of anaphylactic shock and death after the parenteral administration of vitamin B12
Different groups need special care
Encourage diet sources of B where possible, and adherence to the injection schedule.
Metformin, commonly prescribed for diabetes, and proton pump inhibitors used for acid reflux can both reduce B12 absorption over time
It quickly fixes the shortage, which is key to avoiding or handling serious issues
Older Adults : As you age, your bodys ability to absorb B12 decreases, making older adults more susceptible to B12 deficiency