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If anything other than sterile saline was added, it may have been a preservative that you had reacted to
Conclusion The bottom line is that you should always check with your doctor before getting B12 injections
If the Pen prevents you from turning the dose knob until the is in the dose window: Throw away (discard) the Pen, including the unused medicine
Current approaches include: Continuous Use Approach: Based on clinical trials that used continuous daily administration for 12-24 weeks without scheduled breaks
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