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B12 Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
B12 [vitamin b12 (liver-stomach concentrate with intrinsic factor)] is an anti-anemia preparation used to treat anemias that respond to oral hematinics, including pernicious anemia and other megaloblastic anemia and also iron-deficiency anemia. This medication is available in generic form. Common side effects include diarrhea, constipation, or skin rash.
The dose of B12 is one capsule twice a day. B12 may interact with other drugs or supplements. Tell your doctor all medications and supplements you use. During pregnancy, B12 should be used only if prescribed. It is unknown if this drug passes into breast milk. Consult your doctor before breastfeeding.
Our B12 [vitamin b12 (liver-stomach concentrate with intrinsic factor)] Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
B12 FDA Prescribing Information: Side Effects
Rarely, iron in therapeutic doses produces gastrointestinal reactions, such as diarrhea or constipation. Reducing the dose and administering it with meals will minimize these effects in the iron-sensitive patient.
In extremely rare instances, skin rash suggesting allergy has been noted following the oral administration of liver-stomach material. Allergic sensitization has been reported following both oral and parenteral administration of folic acid.
Read the entire FDA prescribing information for B12 (Liver-Stomach Concentrate With Intrinsic Factor) »
Additional B12 Information
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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