Levothyroxine is the active ingredient found in Thyro-Tabs, Soloxine, and Levocrine. Levothyroxine is a medication prescribed for dogs and cats to treat conditions associated with hypothyroidism. This medication can be used in cats in those instances where the thyroid gland has been surgically removed. Levothyroxine requires a prescription and is sold per tablet.
Dogs (Used in cats in certain circumstances)
Levothyroxine provides thyroid replacement therapy to pets with hypothyroidism or other thyroid conditions due to low circulating thyroid hormone.
Keep out of reach of children. Administer with caution to animals with primary hypertension, euthyroidism and clinically diagnosed heart disease.
Soloxine (Virbac), Levotabs (Vetus), Synthroid (Knoll), Thyrosin (Vedco), Thyro-Tabs (Vet-a-Mix)
Levothyroxine is FDA approved for use in dogs only; however, it is a commonly accepted practice to use Levothyroxine in cats as well. Levothyroxine is available by prescription as 0.1 mg, 0.2 mg, 0.3 mg, 0.4 mg, 0.5 mg, 0.6 mg, 0.7 mg, 0.8 mg, and 1 mg tablets. The usual dose in dogs is 0.1 mg per 10 pounds. The usual dose in cats is 0.05 mg to 0.1 mg per cat. The dose of Levothyroxine may require adjustment based on periodic blood tests to determine your pet's T4 level. There are many medications that can affect Levothyroxine. Tell your veterinarian about all the prescription and over-the-counter medications you give your pet, including vitamins, minerals, herbal products, and drugs prescribed by other veterinarians. Levothyroxine will, most likely, be needed for the rest of your pet's life. Long term use of Levothyroxine may cause osteoporosis (bone loss).
Levothyroxine is a replacement for the hormone that the thyroid gland normally produces to regulate the body's energy and metabolism. Levothyroxine is given when your pet's thyroid does not produce enough hormone on its own. Levothyroxine is used to treat hypothyroidism or low thyroid hormone. Levothyroxine may also be used for purposes other than those listed.
Give Levothyroxine exactly as directed by your veterinarian. Do not give this medication in larger amounts or for longer than recommended by your veterinarian. Follow the directions on the prescription label. If you do not understand these directions, ask your pharmacist or veterinarian to explain them to you.
Give the missed dose as soon as you remember. However, if it is almost time for the next regularly scheduled dose, skip the missed dose and give the next one as directed. Do not give a double dose of this medication.
Seek emergency veterinary medical attention if you feel an overdose was given. If given at the proper dose based on blood tests there should be no side effects. Symptoms of Levothyroxine overdose may include dizziness and fainting, increased thirst, urination and hunger, and panting.
Different brands of levothyroxine may not work the same. If the pills look different from the last filling, speak to your pharmacist or veterinarian.
If any of the following serious side effects occur, stop giving Levothyroxine and seek emergency veterinary medical attention: an allergic reaction (swelling of the lips, face, or tongue; difficulty breathing; closing of the throat; or hives). Call your veterinarian if your pet develops any of these serious side effects: sleep problems; personality changes; fever; appetite changes, weight changes. Less serious side effects may be more likely to occur. Continue to use Levothyroxine if your pet experiences: cough; loss of appetite; dizziness, drowsiness; sleep problems; dry mouth; nausea, vomiting, diarrhea; itching or rash. Side effects other than those listed here may also occur. Talk to your veterinarian about any side effect that seems unusual or bothersome to your pet.
Tell your veterinarian if your pet is being given an antidepressant. Talk to your veterinarian or pharmacist before giving any prescription or over-the-counter medications, including vitamins, minerals, and herbal products. Certain medications can be given with Levothyroxine, but they may make Levothyroxine less effective. If you give your pet: sucralfate (Carafate),or aluminum antacids (Maalox, Mylanta), use them 4 hours before or 4 hours after giving Levothyroxine.
Your pharmacist has additional information about Levothyroxine for health professionals that you may read.
Allow plenty of water for the pet to drink. Levothyroxine may be given directly or placed in your pet's food.
Store at room temperature away from moisture and heat.