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Adverse Reactions/Side Effects Generalized: Anaphylactic shock and death have been reported with administration of parenteral vitamin B 12(see WARNINGS)

Gastric banding carries a lower B12 deficiency risk than malabsorptive procedures, as the absorptive anatomy remains largely intact after LAGB

Systemic allergic reactions to the benzyl alcohol in bacteriostatic water are extremely rare, especially given the small amounts used, but as with any injection, if you were to develop symptoms like hives, difficulty breathing, or low blood pressure after an injection, seek medical care

But this may not be the best or long term solution to treat your lower back pain