vitamin b12 injection drug interactions Medications Known to Decrease Levels Vitamin B12 Interactions - GoodRx
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Finally, monitor your baby

I also am worried

Initial treatment may involve more frequent injections, followed by maintenance doses

1,2 Serum vitamin B 12 levels may be artificially elevated in patients with alcoholism, liver disease, or cancer because of decreased hepatic clearance of transport proteins and resultant higher circulating levels of vitamin B 12