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Some experience pain or irritation at the injection site
Consult your physician if you have Lebers optic neuropathy, polycythemia, gout, iron or folic acid deficiency anemia or hypokalemia
Drug Interactions Neomycin, colchicine, para-aminosalicylic acid, or excessive alcohol intake longer than two weeks may cause malabsorption of vitamin B12
What we do not yet know Critical gaps remain in the evidence base
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