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Note: This document contains side effect information about cyanocobalamin. Some of the dosage forms listed on this page may not apply to the brand name Nascobal.
Applies to cyanocobalamin: intramuscular solution
Other dosage forms:
Along with its needed effects, cyanocobalamin (the active ingredient contained in Nascobal) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor or nurse immediately if any of the following side effects occur while taking cyanocobalamin:
Incidence not known
Some side effects of cyanocobalamin may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Incidence not known
Applies to cyanocobalamin: compounding powder, injectable solution, intramuscular solution, nasal gel, nasal spray, oral tablet, oral tablet extended release, sublingual lozenge, sublingual tablet
Frequency not reported: Congestive heart failure, peripheral vascular thrombosis, cardiac arrest, low blood pressure
Patients sensitized to the injectable product are often able to tolerate the oral route without problems.
Frequency not reported: Anaphylactic shock and death, allergic hypersensitivity reactions
Frequency not reported: Mild transient diarrhea, prolonged abdominal pain, prolonged nausea or vomiting
Frequency not reported: Severe dizziness, drowsiness, muscular paralysis, loss of consciousness
Frequency not reported: Itching, transitory exanthema, acneiform eruptions, bullous eruptions
Frequency not reported: Pulmonary edema
Frequency not reported: Hypokalemia
Frequency not reported: Polycythemia vera
Frequency not reported: Vision problems
Frequency not reported: Feeling of swelling of entire body
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