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Assemble the syringe and needle and withdraw the required amount of drug from the ampoule, with B12 this is normally all the drug in the ampoule
The frequency and timing of doses are determined by the healthcare provider
Refrigerate upon arrival and allow the vial to stabilize for a few hours before reconstituting
Common side effects include redness or swelling at the injection site, mild diarrhea, and a temporary feeling of lightheadedness
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