Vitamin B12 Side Effects
Generic name: cyanocobalamin
Medically reviewed by Drugs.com. Last updated on Jul 6, 2024.
Note: This document contains side effect information about cyanocobalamin. Some dosage forms listed on this page may not apply to the brand name Vitamin B12.
For healthcare professionals
Applies to cyanocobalamin: compounding powder, injectable solution, intramuscular solution, nasal gel, nasal spray, oral liquid, oral lozenge, oral tablet, oral tablet chewable, oral tablet disintegrating, oral tablet extended release, sublingual liquid, sublingual lozenge, sublingual tablet.
Cardiovascular adverse events
- Frequency not reported: Congestive heart failure, peripheral vascular thrombosis, cardiac arrest, low blood pressure[Ref]
Hypersensitivity
- Frequency not reported: Anaphylactic shock and death, allergic hypersensitivity reactions[Ref]
Patients sensitized to the injectable product are often able to tolerate the oral route without problems.[Ref]
Gastrointestinal
- Frequency not reported: Mild transient diarrhea, prolonged abdominal pain, prolonged nausea or vomiting[Ref]
Nervous system
- Frequency not reported: Severe dizziness, drowsiness, muscular paralysis, loss of consciousness[Ref]
Dermatologic
- Frequency not reported: Itching, transitory exanthema, acneiform eruptions, bullous eruptions[Ref]
Respiratory
- Frequency not reported: Pulmonary edema[Ref]
Metabolic
- Frequency not reported: Hypokalemia[Ref]
Oncologic
- Frequency not reported: Polycythemia vera[Ref]
Ocular
- Frequency not reported: Vision problems[Ref]
Other
- Frequency not reported: Feeling of swelling of entire body[Ref]
See also:
Neuroforte-R
Neuroforte-R is used for B12 Nutritional Deficiency, pernicious anemia, schilling test, vitamin b12 ...
Cyanokit
Cyanokit is used in an emergency to treat cyanide poisoning. Learn about side effects, interactions ...
Botox
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Nascobal
Nascobal is used for B12 Nutritional Deficiency, pernicious anemia, schilling test, vitamin b12 ...
Hydroxocobalamin
Hydroxocobalamin is used for cyanide poisoning, schilling test, transcobalamin ii deficiency ...
References
1. Cerner Multum, Inc. "Australian Product Information."
2. (2017) "Product Information. Cyanocobalamin (cyanocobalamin)." West Ward Pharmaceutical Corporation
3. Cerner Multum, Inc. "UK Summary of Product Characteristics."
More about Vitamin B12 (cyanocobalamin)
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Patient resources
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Further information
Vitamin B12 side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.