MULTIPLE VITAMINS INJECTION ADULT
Clinical safety rating: caution
Comprehensive clinical and safety monograph for MULTIPLE VITAMINS INJECTION ADULT (MULTIPLE VITAMINS INJECTION ADULT).
Multiple vitamins provide essential cofactors and substrates for various enzymatic reactions, including energy metabolism, red blood cell formation, nerve function, and antioxidant defense. Each vitamin has a specific role; e.g., B vitamins act as coenzymes in metabolic pathways, vitamin C is a cofactor for hydroxylation reactions, and vitamin A supports vision and immune function.
| Metabolism | Vitamins are metabolized via various pathways: B vitamins are converted to coenzyme forms (e.g., pyridoxal phosphate, thiamine pyrophosphate) primarily in the liver; vitamin C is metabolized to oxalate and ascorbate-2-sulfate; vitamin A is metabolized to retinoic acid; vitamin D undergoes hydroxylation in liver (25-hydroxylation) and kidney (1α-hydroxylation). |
| Excretion | Renal excretion of water-soluble vitamins (e.g., B complex, C) with minor biliary/fecal elimination for fat-soluble vitamins (A, D, E, K). |
| Half-life | Variable; thiamine (B1): 10-20 minutes; pyridoxine (B6): 15-20 days; cyanocobalamin (B12): 6 days; ascorbic acid (C): 2-3 hours; fat-soluble vitamins: A (days), D (20-30 hours), E (13-24 hours), K1 (2-3 hours). |
| Protein binding | Variable; thiamine: <10%; pyridoxal phosphate: 60%; cyanocobalamin: bound to transcobalamin (90%); ascorbic acid: 25%; retinol: bound to retinol-binding protein; cholecalciferol: bound to vitamin D-binding protein (85-90%); tocopherol: 50-80%; phylloquinone: 90%. |
| Volume of Distribution | Variable; thiamine: 0.3 L/kg; B12: 0.5 L/kg; ascorbic acid: 0.3 L/kg; retinol: 0.2 L/kg; cholecalciferol: 0.1 L/kg; tocopherol: 5.0 L/kg (lipid soluble). |
| Bioavailability | Intravenous: 100%; intramuscular: 70-90% (B12: 100% for hydroxocobalamin, <50% for cyanocobalamin). |
| Onset of Action | Intravenous: immediate (water-soluble vitamins); intramuscular: 15-30 minutes for B12, 1-2 hours for others. |
| Duration of Action | Water-soluble: 24-48 hours; fat-soluble: longer (weeks to months for A, D). |
10 mL intravenously once daily, infused over at least 30 minutes or as a component of parenteral nutrition.
| Dosage form | SOLUTION |
| Renal impairment | No dose adjustment required for renal impairment; however, monitor for vitamin accumulation in severe renal failure. |
| Liver impairment | No specific Child-Pugh based adjustments; use with caution in severe hepatic impairment due to risk of vitamin K accumulation. |
| Pediatric use | Safety and efficacy not established; use in pediatric patients is not recommended unless directed by a specialist. |
| Geriatric use | No specific dose adjustment required; monitor for potential vitamin excess and interactions with other medications. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for MULTIPLE VITAMINS INJECTION ADULT (MULTIPLE VITAMINS INJECTION ADULT).
| Breastfeeding | Vitamins are normally present in breast milk; supplementation at recommended daily allowances is safe. M/P ratios not established for multivitamin products; individual vitamins have variable M/P ratios (e.g., vitamin A ~0.5, vitamin C ~1.0). Avoid megadoses, especially vitamin A (retinol >10,000 IU/day) which can accumulate in milk and cause hypervitaminosis A in infant. |
| Teratogenic Risk | Vitamin A (as retinol) >10,000 IU/day is teratogenic in first trimester (increased risk of CNS, cardiovascular, and craniofacial defects). Standard doses (≤5,000 IU/day) are considered safe. Vitamins C, D, E, B-complex, and folic acid at recommended levels are not associated with increased fetal risk. High-dose pyridoxine (B6) may cause neonatal seizures if used near term. Folic acid (0.4-0.8 mg/day) reduces neural tube defect risk. |
■ FDA Black Box Warning
No black box warning.
| Serious Effects |
Hypersensitivity to any component; pernicious anemia (vitamin B12 deficiency) without concurrent B12 therapy; hypervitaminosis A or D; severe renal impairment (if product contains aluminum).
| Precautions | Allergic reactions may occur (e.g., anaphylaxis) especially with thiamine or folic acid. Use with caution in patients with malabsorption syndromes, renal impairment (risk of aluminum toxicity from excipients), or vitamin B12 deficiency unmasked by folic acid. Monitor for hypersensitivity. Not for intravenous bolus administration due to risk of shock. |
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| Fetal Monitoring | Monitor for signs of vitamin toxicity (e.g., serum vitamin A, B6, D levels if high doses used). Check maternal serum folate and B12 levels in pregnancy. Assess fetal growth and anatomy via ultrasound; high-dose vitamin A warrants detailed fetal anomaly scan. Monitor neonatal vitamin K levels if maternal megadoses. |
| Fertility Effects | No adverse effects on fertility at standard doses. High-dose vitamin A (retinol) may disrupt menstrual cycle and impair fertility. Adequate folate and B12 support fertility and early embryonic development. |