Health professionals with the Office of Dietary Supplements recommend that adults receive between 2.4 and 2.8 mcg of vitamin B-12 each day in order to remain healthy. This water-soluble vitamin is found in a variety of foods, including beef, fish and dairy products, and it helps your body form red blood cells. If you are unable to consume enough vitamin B-12 from your daily diet, your doctor may recommend vitamin B-12 injections, also called cyanocobalamin. Discuss the side effects of these injections with your doctor before beginning treatment.
Skin Reaction at Injection Site
You may develop a skin reaction at the injection site after receiving a vitamin B-12 shot. The treated skin region may appear unusually red or swollen and may be painful to the touch, Drugs.com reports. You may also experience sensations of itching across your skin following treatment with a vitamin B-12 injection. These side effects are temporary and typically subside within a few hours of treatment. If you develop a persistent or severe skin reaction, such as swelling across your entire body, consult a medical professional.
Stomach Discomfort
Mild to moderate stomach discomfort may occur as a side effect after you receive this injection. You may feel nauseous, vomit or develop diarrhea. Frequent bowel movements may also occur in conjunction with abdominal bloating or cramping. Talk with a doctor if diarrhea side effects persist for longer than a couple of days.
Flu-like Symptoms
Following treatment with a vitamin B-12 injection, you may develop flu-like symptoms. These side effects include fever, weakness, headache, joint pain and dizziness. If you develop flu-like symptoms, you may find it difficult to participate in your usual work, school or social activities. Consult a medical professional for further evaluation and care if you develop these side effects after having a vitamin B-12 shot.
Pulmonary Edema or Congestive Heart Failure
Infrequently, pulmonary edema or congestive heart failure occurs as a side effect of an injection of vitamin B-12, RxList warns. These side effects occur when fluid accumulates in your lungs or around your heart. Symptoms of pulmonary edema or congestive heart failure may include rapid weight gain, breathing difficulties, unusual body swelling or chest pain. Seek emergency medical care if you experience any of these side effects. In the absence of appropriate medical intervention, pulmonary edema or congestive heart failure may be fatal.
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