how long does it take before b12 injections work Quickly a Shot Work? How Long Does It Take

With the adjuvanted vaccine, inflamed areas were measurable by CT in all cats on days 7 and 21, whereas they were detected only on day 7 and only in 20% of cats from the non-adjuvanted vaccine group

Due to dexamethasone's mechanism of action, there is a possible risk of fetal adrenal suppression

Rood advises

You dont necessarily have to get labs as a baseline if you are symptomatic (symptoms listed above)

Finally, if the serum cobalamin concentration at the time of reevaluation is subnormal [lower than normal], further work-up is required to definitively diagnose the underlying disease process and cobalamin supplementation should be continued weekly or bi-weekly