Iron, B12, and folate

Iron, B12, and folate

Drug monograph · NCLEX study reference
Trade names	B12
Therapeutic class	Antianemic
Pharmacologic class	Oral and IV iron, vitamin B12, folate
Onset / peak / duration	Reticulocyte response in about a week; full correction over weeks to months.
Half-life / level	Variable; monitor hematologic indices.
Routes	PO (oral), IV, IM, SubQ, Intranasal
High-alert (ISMP)	No
Black box warning	None
Antidote / reversal	Deferoxamine for severe iron overdose.
Pregnancy / lactation	Iron and folic acid commonly used in pregnancy.

Nursing pharmacology study reference (NCLEX-style monograph). Numeric values are standard teaching ranges for study and must be verified against current manufacturer labeling before clinical use. This is educational content, not prescribing guidance.

Iron, B12, and folate (brand name B12) — Antianemic; Oral and IV iron, vitamin B12, folate.

Identification

• Therapeutic class: Antianemic.
• Pharmacologic class: Oral and IV iron, vitamin B12, folate.

Pharmacology

• Mechanism of action: Replace iron for hemoglobin synthesis; B12 and folate support red cell maturation.
• Onset / peak / duration: Reticulocyte response in about a week; full correction over weeks to months.
• Half-life / therapeutic level: Variable; monitor hematologic indices.

Clinical use

• Indications: Iron-deficiency anemia (iron), pernicious or dietary B12 deficiency (cyanocobalamin), folate deficiency and pregnancy (folic acid).
• Usual dose, route, frequency: Ferrous sulfate PO once daily or every other day; iron sucrose IV; B12 IM, SubQ, intranasal, or high-dose PO; folic acid PO.
• Maximum dose / adjustments: Lifelong B12 (IM) for pernicious anemia; IV iron for intolerance or malabsorption.

Safety

• Contraindications: Iron overload conditions (hemochromatosis), hypersensitivity (IV iron).
• Black box warning: None.
• Interactions: Oral iron with antacids, calcium, tetracyclines, fluoroquinolones, and levothyroxine (separate doses); vitamin C enhances iron absorption (food); proton pump inhibitors reduce iron absorption.
• Pregnancy / lactation: Iron and folic acid commonly used in pregnancy.
• High-alert: No.

Adverse effects

• Common side effects: Oral iron causes constipation, dark stools, GI upset, teeth staining (liquid).
• Serious effects to report: IV iron anaphylaxis, iron overdose (a leading cause of pediatric poisoning death), masking of B12 deficiency by folate alone.
• Antidote / reversal: Deferoxamine for severe iron overdose.

Nursing process

• Assessment before administration: CBC, iron studies, B12 and folate levels, GI tolerance.
• Interventions during therapy: Give oral iron on an empty stomach if tolerated, with vitamin C; use a straw for liquid iron; monitor IV iron for reactions; confirm B12 status before treating with folate alone.
• Monitor: Hemoglobin and hematocrit, reticulocytes, iron studies, B12 and folate.
• Evaluation / expected outcome: Corrected anemia.

Patient teaching

• Patient teaching: Black stools are expected with oral iron; take with vitamin C and away from antacids and dairy; keep iron away from children (overdose danger).
• Notify provider if: Severe constipation, signs of allergic reaction with IV iron, no improvement in symptoms.
• Administration tips: Oral iron between meals with vitamin C; separate from interacting drugs; liquid through a straw.