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Vitamin B Complex for Pets: Deficiency Treatment & Wellness Support

Published on September 10, 2024
Updated on November 5, 2025

Nutritional vitamin supplement used to treat and prevent Vitamin B deficiencies in dogs and cats.

Summary

Used For:

Prevention and treatment of Vitamin B deficiency may improve appetite or counter fatigue

Brands:

Species:

Dogs and cats

Other names:

Drug type:

Supplement

Prescription required:

No

Pregnancy and lactation:

Generally considered safe for use in pregnant and lactating animals, but always discuss with your veterinarian before supplementing.

Side effects:

Rare

General description

Vitamin B Complex is a nutritional supplement containing several B Vitamins, usually including thiamine, riboflavin, pyridoxine, niacinamide, d-panthenol and cyanocobalamin. Vitamin B Complex is commonly used in veterinary medicine to treat and prevent Vitamin B deficiencies.

Uses

Prevention and treatment of Vitamin B deficiencies in dogs and cats.

How it works

Vitamin B Complex is absorbed and utilized by the tissues of the body when injected.

Dosage

Dogs weighing less than 15 kilograms: Inject 1 milliliter intravenously, intramuscularly or subcutaneously every 24 hours as needed.

Dogs weighing more than 15 kilograms: Inject 2-4 milliliters intravenously, intramuscularly or subcutaneously every 24 hours as needed.

Cats: Inject 1 milliliter intravenously, intramuscularly or subcutaneously every 24 hours as needed.

Medications should only be administered to pets under the direct guidance of a veterinarian.

Information provided outlines what a typical dose might look like. Always consult your veterinarian on the appropriate dose for your specific animal when using any vitamin, supplement, off-label or prescription products. Some vets may prescribe outside of these ranges based on specific needs of the patient.

Forms

Vitamin B Complex comes in an injectable liquid. Most products contain 100 milligrams thiamine, 5 milligrams riboflavin, 10 milligrams pyridoxine, 100 milligrams niacinamide, 10 milligrams d-panthenol and 100 micrograms cyanocobalamin per milliliter.

The type and amount of B Vitamins may vary depending upon the individual product.

Storage information & handling

See label for storage instructions specific to the product in question. Injectable Vitamin B Complex should be stored at 36-46 degrees Fahrenheit and out of direct sunlight. Do not allow product to freeze.

What results can I expect?

With appropriate treatment, resolution of Vitamin B deficiencies should occur within the treatment period.

Missed Dosage

Do not administer 2 doses back-to-back. If a dose is missed, continue with the next dosage at the scheduled time.

Overdose / acute toxicity

Rare, generally the body will appropriately expel any unnecessary B vitamins via urine.

Side effects

*Rare, but hypersensitivity reactions can occur.

Contraindications

*Do not use in animals with a known hypersensitivity to B complex.

Drug interactions

None

Precaution

None

Sources

Plumb’s Veterinary Drug Handbook

Disclaimer
The information contained on this page is for educational purposes only. This medication should only be given under the advice of a veterinarian who has examined your pet under the laws applicable to your state of residence.

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