Thyro-L (levothyroxine sodium powder, USP) for Horses, 1 pound

For use in horses for correction of conditions associated with low circulating thyroid hormone (hypothyroidism)
Thyro-L (levothyroxine sodium powder, USP) for Horses, 1 pound
Price: $ 26.95
Case Pack Price (Qty: ): $ 0.00

This product requires a prescription

1. We’ll ask for your vet’s info during checkout.
2. We’ll verify your prescription and ship your order.
Details and state availability.

The Original Levothyroxine Sodium Powder Supplement for Horses

  • Contains Levothyroxine Sodium powder, USP (T-4) for predictable therapeutic results
  • Highly reliable and stable thyroxine replacement hormone
  • Adjunct treatment for weight loss in horses with insulin resistance
  • Aid in laminitis prevention
  • Aid in preventing hyperlipidemia

Thyro-L, the original levothyroxine sodium powder, remains the market-leader for a reason-it performs. With unparalleled expertise in stable levothyroxine formulations, LLOYD consistently delivers the therapeutic results you expect.

LLOYD, Inc. offers a complete line of quality products in research-proven drug dosage forms. This product is formulated in a palatable flavor base that is eagerly accepted by horses.

All LLOYD products are manufactured under strict quality control guidelines to assure consistency and are available through licensed veterinarians.

PDF Prescribing Information

Our pharmacists are available for counseling regarding prescriptions purchased from Pet Supplies Delivered before and after dispensing. Monday - Friday, 9 AM - 2 PM CST. 1-800-367-4444.

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 0.22% levothyroxine sodium powder, USP

The suggested initial dose is 0.5 to 3.0 mg levothyroxine sodium (T-4) per 100 pounds body weight (1 to 6 mg per 100 kg) once per day or in divided doses. The recommended daily dose is 1/2 to 2 1/2 level teaspoons for a 500 kg (1,100 lb) horse.

Response to the administration of Thyro-L should be evaluated clinically until an adequate maintenance dose is established. In most horses, this is usually in the range of 6 to 36 mg (1/2 to 3 level teaspoons) total daily dose of T-4. Serum T-3 and T-4 values can vary greatly among individual horses on thyroid supplementation. Dosages should be individualized-and animals should be monitored daily for clinical signs of hyperthyroidism or hypersensitivity.


Thyro-L can be administered by mixing the daily dose in the concentrate or by top dressing on grain, preferably rolled or ground. To facilitate proper adhesion of Thyro-L to the ration, slightly moisten the grain with water or liquid supplement.