Verify your vial size, BAC water volume, and the syringe units before administering your dose
Storage (after first puncture): 28C, used within 28 days
It's incredibly difficult to "overdose" on B12 because your body efficiently removes what it doesn't use
If you have a temporary deficiency or increased requirement (say, after a surgery or during recovery from an acute illness), you might only need a short course, perhaps a few weeks of injections, until your vitamin levels normalize or you can meet your needs by mouth again
These are distinct clinical scenarios with different sequencing rules and different CPT and HCPCS pairing implications
Unfortunately, some patients have difficulty absorbing an adequate amount of vitamin 12 because they do not produce enough stomach acid due to a condition called autoimmune atrophic gastritis which can cause a deficiency of vitamin B12