Common side effects include: Injection site reactions mild pain, redness, swelling, or bruising at the injection site, typically resolving within a few days Headache usually transient and manageable with standard analgesia Nausea or dizziness particularly in the initial treatment phase Skin reactions including itching, mild rash, or acneiform eruptions Temporary urine discolouration red or orange urine is harmless and expected Diarrhoea or flushing usually mild and self-limiting In patients with severe megaloblastic anaemia, low potassium levels (hypokalaemia) may occur during initial intensive treatment, but this is uncommon in routine maintenance therapy
To add more to your Medicare plan, the best option is to enroll in a MAPD, or Medicare Advantage Prescription Drug plan
This is an area that requires further research
Yeh CW, Tseng LH, Yang CH, Hwang CF
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"Tolerable Upper Intake Levels For Vitamins And Minerals" (PDF)