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Side Effects Of B12 Injections. Most documentation papers indicate you might experience any of these. Side effects requiring immediate medical attention. However B-12 shots may have other side effects. There are many common side effects associated with B12 injections that need to be reported to a health care provider only if they persist for an extended amount of time.
B12 Injection Side Effects. Injectable vitamin B-12 which is used to treat significant deficiencies can cause the following side effects. Injecting 02 mcgkg of vitamin B12 into the muscle or under the skin once daily for 2 days followed by a 1000 mcg injection daily for 2-7 days and another 100 mcg. For vitamin B12 deficiency. Along with its needed effects cyanocobalamin the active ingredient contained in Vitamin B12 may cause some unwanted effects. Mild diarrhea andor upset stomach.
However in very rare cases some people can experience side effects caused.
Chest pain increased heart rate heart palpitations low blood pressure chest tightness cough are some of the side effects of B12 injections. People who have a rare blood disorder polycythemia vera may. Muscle cramps weakness irregular heartbeat. Safety and Side Effects Vitamin B12 injections are generally considered to be very safe. For vitamin B12 deficiency. A rapid heartbeat.