Cyanocobalamin is a man-made form of vitamin B12. Vitamin B12 is important for growth, cell reproduction, blood formation, and protein and tissue synthesis.

Cyanocobalamin nasal (for use in the nose) is used to treat vitamin B12 deficiency in people with pernicious anemia and other conditions.

Cyanocobalamin nasal is usually given after treatment with an injection form of this medicine.

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  • Nascobal
  • Incidence not known
    Abdominal or stomach pain
    bleeding from the gums or nose
    blue lips and fingernails
    chest pain
    cough
    coughing that sometimes produces a pink frothy sputum
    decreased urine output
    difficult, fast, noisy breathing, sometimes with wheezing
    difficulty with swallowing
    dilated neck veins
    dizziness
    extreme fatigue
    eye pain
    fast heartbeat
    headache
    hives, itching, or skin rash
    increased sweating
    irregular breathing
    irregular heartbeat
    pale skin
    puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
    ringing in the ears
    swelling of the face, fingers, feet, or lower legs
    tightness in the chest
    unusual tiredness or weakness
    weight gain
    Some cyanocobalamin side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:

    Incidence not known
    Diarrhea
    skin rash with a general disease
  • (cyanocobalamin) nasal spray