Vitamin B complex
Vitamin B complex is a combination of water-soluble vitamins essential for various metabolic processes. It is primarily used to treat or prevent multiple deficiencies of B vitamins, which frequently occur in patients with **renal disease**, **hepatic disease**, or **significant anorexia**. > **Clinical Warning:** Parenteral administration of B vitamins is **not** a substitute for comprehensive nutritional support (e.g., enteral feeding). **Clinical Pearl:** Many commercial injectable products are formulated for large animals and may contain additional vitamins (like Vitamin C) or minerals. Care must be taken to ensure the specific product is safe for small animals.
Mechanism: B vitamins act as essential **cofactors for enzymes** involved in intermediary metabolism and biosynthesis. They facilitate energy production, amino acid metabolism, and cellular maintenance. Key pathways include: * Thiamine (B1) → Carbohydrate metabolism * Riboflavin (B2) & Niacin (B3) → Oxidation-reduction reactions (ATP production) * Pyridoxine (B6) → Amino acid metabolism * Cobalamin (B12) → Nucleic acid synthesis and red blood cell formation
Dosing by species
- Vitamin B deficiency · 1 ml/dog (dogs up to 15 kg); 2-4 ml/dog (dogs >15 kg) · SC/IM/IV · q24h · Give IV slowly or diluted in fluids to prevent anaphylaxis.
- Vitamin B deficiency · 1 ml/cat · SC/IM/IV · q24h or as required · Give IV slowly or diluted in fluids to prevent anaphylaxis.
Doses are a clinical reference for licensed veterinary professionals. Always confirm against the current label and the individual patient.
Routes of administration
Contraindications
- Known hypersensitivity to any component of the preparation
Adverse effects
- Anaphylaxis (particularly with rapid IV administration)
- Pain at injection site (IM/SC)
Monitoring
- Clinical signs of resolution of deficiency (improved appetite, energy)
- Monitor for signs of anaphylaxis during and immediately after IV administration
Overdose
Water-soluble B vitamins have a wide margin of safety, as excess is readily excreted in the urine. However, **toxicity may occur** if using large animal multivitamin products that also contain fat-soluble vitamins (A, D, E, K).
VetSheet drug reference is intended for licensed veterinary professionals as a clinical decision-support aid, not a substitute for professional judgement or the manufacturer’s current label.