vitamin b12 injection overdose Cyanocobalamin (Dodex): Uses, Side Effects, Dosage & Reviews Vitamin B12 Supplements and Injections

Learn More MOOD & FOCUS Fuel your brain with B12 for clarity, focus, and emotional balance

You may experience redness, swelling, or a mild tenderness

Certain medications The following drugs can reduce levels of vitamin B12 in your body: Antibiotics -- long-term use can lower vitamin B levels generally Anti-seizure drugs Chemotherapy medicines, especially methotrexate Drugs used to reduce stomach acid, like H2 blockers (Pepcid AC, Tagamet, Zantac) and proton pump inhibitors (Nexium, Prevacid, Prilosec) Metformin (Glucophage) -- taken for diabetes Colchicine -- taken for gout Some cholesterol-lowering medications Other causes You're over 65

These are readily absorbed and utilized by the body

Excess vitamin B12 is linked to increased cancer growth in certain types of cancer.[ref] Methotrexate, a chemotherapy drug, works by inhibiting the production of methyl folate, thus limiting methionine and DNA synthesis for cell growth

Common Causes of B12 Deficiency There are many reasons for vitamin B12 deficiency