The same is true of B vitamin complex supplements, which deliver 50 to 500 micrograms (i.e., 20 to 200% of the RDA), as well as for most supplements containing only vitamin B12, which deliver up to 1,000 micrograms (about 400% of the RDA)
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With IV drips, you will need to sit in a lounge or a private room for at least an hour and a half, which might not be feasible for your lifestyle and commitments
Although the progression of neurologic complications is generally gradual, such symptoms may not be reversed with treatment of vitamin B 12 deficiency, especially if they have been present for a long time