This product usually has no side effects. If you have any unusual effects, contact your doctor or pharmacist promptly.
If your doctor has directed you to use this medication, remember that he or she has judged the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
Before taking cyanocobalamin, tell your doctor or pharmacist if you are allergic to it; or to any form of vitamin B12; or to cobalt; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.