Subcutaneous sites include the abdomen and outer upper arms
That being said, the conversion of severe anemia to normal production of red blood cells can temporarily lead to low potassium levels and a high platelet count
[9] Visual disturbances have been reported in patients with Leber hereditary optic neuropathy, and rapid B12 administration may precipitate optic nerve atrophy in this genetically predisposed population, mandating extreme caution or alternative therapy
[8] In addition, drugs that affect blood cell production, such as certain chemotherapy agents or some HIV medications, may blunt the benefits of vitamin B or alter blood counts
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The injection is administered into a muscle (buttocks, thigh, or arm), and the appointment is quick, lasting less than 30 minutes