fatigue after b12 injections does a injection make you tired Feeling tired, foggy, or run-down? It could be Why do I feel worse

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Drug/Laboratory Test Interactions Persons taking most antibiotics, methotrexate, and pyrimethamine invalidate folic acid and vitamin B 12 diagnostic blood assays

We received a telephone call yesterday from a very distraught member who was diagnosed with PA twenty-three years ago and has been having monthly injections since then