Cyanocobalamin (B12) Side Effects

Please note - some side effects for Cyanocobalamin (B12) may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA at http://www.fda.gov/medwatch/ or 1-800-FDA-1088 (1-800-332-1088).

Side Effects of Cyanocobalamin (B12) - for the Consumer

Cyanocobalamin (B12)

All medicines may cause side effects, but many people have no, or minor, side effects. If any of the following most COMMON side effects continue or become bothersome when using Cyanocobalamin (B12), check with your doctor: Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Cyanocobalamin (B12):

Mild, temporary diarrhea.

Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); calf pain, swelling, or tenderness; chest pain; feeling of swelling throughout the entire body; fever, chills, or persistent sore throat; irregular heartbeat; muscle weakness or cramping; shortness of breath; unusual bruising or bleeding.

Cyanocobalamin (B12) Chewable Tablets

All medicines may cause side effects, but many people have no, or minor, side effects. When used in small doses, no COMMON side effects have been reported with Cyanocobalamin (B12) Chewable Tablets. Seek medical attention right away if any of these SEVERE side effects occur when using Cyanocobalamin (B12) Chewable Tablets:

Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue).

Cyanocobalamin (B12) Controlled-Release Tablets

All medicines may cause side effects, but many people have no, or minor, side effects. When used in small doses, no COMMON side effects have been reported with Cyanocobalamin (B12) Controlled-Release Tablets. Seek medical attention right away if any of these SEVERE side effects occur when using Cyanocobalamin (B12) Controlled-Release Tablets:

Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue).

Cyanocobalamin (B12) Spray

All medicines may cause side effects, but many people have no, or minor, side effects. When used in small doses, no COMMON side effects have been reported with Cyanocobalamin (B12) Spray. Seek medical attention right away if any of these SEVERE side effects occur when using Cyanocobalamin (B12) Spray:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); calf swelling or tenderness; chest pain; irregular heartbeat; muscle weakness or cramping; shortness of breath; swelling of the hands, ankles, or feet; unusual bruising.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch .

Cyanocobalamin (B12) Tablets

All medicines may cause side effects, but many people have no, or minor, side effects. When used in small doses, no COMMON side effects have been reported with Cyanocobalamin (B12) Tablets. Seek medical attention right away if any of these SEVERE side effects occur when using Cyanocobalamin (B12) Tablets:

Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue).

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date, and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This information does not endorse drugs, diagnose patients, or recommend therapy. This drug information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug of drug combination is safe, effective, or appropriate for any given patient. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of information provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse, or pharmacist.