Your provider makes all final treatment decisions
Although our experience suggests that hydroxocobalamin does not cause clinically significant interference with non-invasive pulse oximetry, there is evidence to suggest that co-oximetric blood gas analysis with several unique analyzers may be altered in the presence of hydroxocobalamin, specifically with false elevations of carboxyhemoglobin and methemoglobin concentrations and underestimation of true oxygen saturation values.5 There is no available evidence regarding the accuracy of other commonly utilized oximetric monitoring modalities (e.g., cerebral oximetry) following hydroxocobalamin administration

Some individuals experience stinging, pain, or tingling instead of itching. Other symptoms of vitamin B12 deficiency Other symptoms of the condition are listed by Bupa as: Feeling very tired Breathlessness even after a little exercise Heart palpitations Headaches A reduced appetite A sore mouth The health organisation adds: If you have vitamin B12-deficiency anaemia, you may also look pale or jaundiced (have a yellowy tinge to your skin and the whites of your eyes)
Always share your full health history with your provider
Moreover, it is generally suggested to give B12 in the morning or no later than 2pm to avoid potential sleep issues
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