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Vitamin B12 Shot Side Effects

Vitamin B12, also known as cyanocobalamin, is a water-soluble vitamin and available in injection form. Vitamin B12 is important in the production of red blood cells and central nervous system maintenance. It is generally prescribed to treat anemia and to prevent vitamin B12 deficiency for vegetarians and/or vegans. As with all prescription medications, side effects may occur while using vitamin B12.

  1. Common Side Effects

    • The most common side effects while taking vitamin B12 include headache, dizziness, nausea, upset stomach, diarrhea, numbness, tingling, fever, joint pain and injection site irritation. Most medications can cause side effects that are normal and can be tolerated. If these side effects worsen or become severe, contact a health care professional. When taking new medications, an adjustment period is normally required for the body to adapt.

    Serious Side Effects

    • Vitamin B12 can cause serious side effects during administration. When serious side effects occur, you should seek medical attention right away. The serious side effects of vitamin B12 include chest pain, shortness of breath, edema, rapid weight gain, unusual warmth or redness in extremities.

    Warnings

    • Some side effects of vitamin B12 may be dangerous and individuals should be cautious. These dangerous side effects include hives, breathing difficulty and swelling due to an allergic reaction. Consult a health care professional immediately, these side effects may need immediate medical attention.

    Precautions

    • Prior to starting vitamin B12 therapy, inform your physician of any pre-existing medical conditions. It is not suggested to use this medication if you are allergic to cobalt or have been diagnosed with Leber's disease. Individuals with eyes diseases, infections and allergies should use caution prior to starting vitamin B12 therapy. After the consultation, the physician will prescribe the proper dosage based on current medical condition and history.

    Drug Interactions

    • Drug interactions can occur when one or more medications are taken simultaneously. When interactions occur, this may cause side effects or ineffectiveness of the medications. Drugs that may cause an interaction include antibiotics, methotrexate, pyrimethaimine, colchicines and consuming alcohol within a two week time frame. It is important to consult a physician about all medications and supplements prior to starting vitamin B12 therapy.

    Overdose

    • Seek emergency medical attention or contact the local poison control center immediately if overdose is suspected. An overdose while using vitamin B12 is rare.

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