Thyro-L

Levothyroxine sodium powder for hypothyroidism in horses and dogs; thyroid hormone replacement. Powdered levothyroxine sodium (L-thyroxine). Mechanism: T4 is converted peripherally to active T3 by deiodinases → T3 binds nuclear thyroid hormone receptors → gene transcription regulation → controls basal metabolic rate, cardiac function, GI motility, skin/hair quality, and mentation. For hypothyroidism in horses and dogs. Dose-sensitive — must titrate to effect. Key information Levothyroxine powder — for equine hypothyroidism/weight management. Store dry. Mix with feed. Monitor thyroid levels after 4–8 weeks.

Oral powder (horses): mix accurately measured dose into a small portion of grain or carrier feed daily. Use a dedicated measuring spoon. Administer at consistent times. Store at room temperature; protect from light. If a dose is missed Administer as soon as you remember. If it is almost time for the next scheduled dose, skip the missed dose and resume the normal schedule. Never double up doses to make up for a missed one. A single missed dose is unlikely to cause immediate clinical problems.

Thyrotoxicosis (overdose): tachycardia, panting, weight loss, polydipsia, anxiety, diarrhea, hypertension. Cardiac arrhythmias. Clinical signs resolve with dose reduction. Monitor T4 levels.

For animals Monitor T4 levels and clinical signs. Avoid inhalation of powder during preparation. See levothyroxine precautions. For people handling this medication Wash hands thoroughly with soap and water after handling. Avoid contact with eyes; if contact occurs, flush with water for 15 minutes and seek medical attention. Keep out of reach of children. If accidental ingestion occurs, contact Poison Control (1-800-222-1222). Thyroid hormone powder — Wash hands thoroughly with soap and water after handling. after handling. Avoid inhaling dust. Keep out of reach of children.

Contact your veterinarian. Levothyroxine overdose causes hyperthyroid-like signs.