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Your doctor will typically monitor your response and perhaps repeat blood tests for vitamin levels (or relevant markers like homocysteine levels, complete blood count, etc.) after a certain number of injections
Furthermore, it should be administered with caution in patients with renal impairment, as it may heighten the risk of adverse reactions
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Some patients experiment with twice-weekly dosing, but published data doesn't support additional benefit
Warnings Patients who have early Leber's disease (LHON) a hereditary disease that causes optic nerve atrophy have been found to suffer severe and swift optic atrophy when treated with vitamin B12
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