What are the possible side effects of Vitamin B-12 (Cyanocobalamin)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have a serious side effect such as: chest pain feeling short of breath, even with mild exertion swelling, rapid weight gain; or unusual warmth, redness, or pain in an arm or leg Less serious side effects may include: headache, dizziness, weakness nausea, upset stomach, diarrhea numbness or tingling fever joint pain swollen tongue swelling; or itching or rash This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
