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Biochemical properties
If side effects do occur, they are generally mild and may include: Pain, discomfort, swelling, or redness at the injection site Diarrhea Headache Bloating Nausea Numbness or tingling Serious side effects are rare and may include: Confusion Dizziness or fainting Muscle pain, cramps, or weakness Extreme thirst Facial flushing Frequent urination Palpitations Fatigue Difficulty breathing Coughing or noisy breathing (wheezing) Extreme pain, swelling, warmth or tenderness in one leg Difficulty swallowing Rash Itching over the body If you experience serious side effects, contact your doctor right away
Some tips to get you through the transitional period when starting B12 therapy include: Resting more until the fatigue and flu-like feelings pass
(3) Health professionals recommend a full blood count and reticulocyte count 7-10 days after starting treatment, and eight weeks to confirm normal blood levels
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