With intramuscular injections of B12, any excess will result in high levels within your blood so you may experience side effects such as headache, dizziness, tiredness, or gastrointestinal issues including nausea, until your body has metabolised any excess through your kidneys enroute to excretion via urine
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If given IV, it must be injected slowly (often over at least 5 minutes or diluted in a larger volume bag and infused)
(18) If you regularly take any of these medications, its a good idea to discuss your vitamin B12 status with your healthcare provider