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vitamin b12 injection is iv or im Dosage for Adults: Guidelines POLYBCOM Vitamin B12 Injection –
Description
NNMT catalyses the transfer of a methyl group from S-adenosylmethionine (SAM) to nicotinamide, the precursor in the NAD+ salvage pathway

Bondevik GT, Schneede J, Refsum H, et al

I would not wait either

** 30 min intervals between subcutaneous injections

For PSVT conversion in pediatric patients weighing less than 50kg, the usual dose is 0.05-0.1mg/kg per dose, given IV
Lancet 379, 361372 (2011)
