Certain medications may also interfere with absorption and cause deficiency, in particular, medicines prescribed for heartburn, antibiotics, blood pressure medicine, cholesterol-lowering drugs, diabetes medications and antipsychotic drugs
They start with 510 shots over a few weeks, then gradually space them farther apart, sometimes by months
These typically resolve within the first week
Some people feel better after a Vitamin B12 shot, especially if fatigue, weakness, or neurologic symptoms were related to deficiency
Key Takeaways The standard initial dose for severe deficiency is 1,000 mcg intramuscularly daily or every other day
The Basics of Vitamin B12 Vitamin B12, also known as cobalamin, is one of 8 B vitamins humans need to stay healthy