Neomycin, colchicine, para-aminosalicylic acid, or excessive alcohol intake longer than two weeks may cause malabsorption of vitamin B12. Chloramphenicol and other drugs having bone marrow suppressant properties may cause a lack of therapeutic response to vitamin B12
This is given through an intramuscular injection
Hangovers are a common side effect of drinking too much alcohol
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Typically, B12 injections are administered once a week
Gastrointestinal conditions such as pernicious anemia (autoimmune destruction of gastric parietal cells), Crohn's disease, celiac disease, and prior gastric or ileal surgery significantly impair absorption