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Control your pet’s hypothyroid (underactive thyroid gland) with Soloxine. This medication is prescribed by many veterinarians in order to provide... Learn More
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Control your pet’s hypothyroid (underactive thyroid gland) with Soloxine. This medication is prescribed by many veterinarians in order to provide thyroid replacement therapy for dogs and some cats who suffer from subnormal thyroid gland function because of a medical condition or surgical removal (mostly cats).

What is Soloxine? Soloxine is an oral medication that contains levothyroxine. Levothyroxine is a replacement for the hormone that the thyroid gland normally produces to regulate the body’s energy and metabolism. Supplementation with levothyroxine is necessary when your pet has an underactive thyroid gland (hypothyroidism).

Formulated for: dogs and cats. Occasionally, birds may receive Soloxine as directed by a veterinarian.

How is this medication given? The correct dosage of Soloxine for your pet will be determined by your veterinarian. This medication is given orally (by mouth) in dogs and cats. If given to birds, your veterinarian may instruct you to give this medication in the drinking water. Your pet should have unlimited access to water while on this medication. This medication can be given with or without food as per your veterinarian’s instructions. Different brands of this medication may vary so try to keep your pet on the same brand if possible. Your veterinarian may need to recheck thyroid hormone levels and adjust the dose if the brand of medication changes. Your veterinarian will likely require routine blood testing periodically in order to monitor thyroid function and to adjust the medication dosage as necessary. Only give this medication to the pet for which your veterinarian has prescribed it for.

How does this medication work? Levothyroxine is the active ingredient in Soloxine. It mimics the hormone thyroxine, which is produced naturally by the thyroid gland. Pets with an underactive thyroid gland (hypothyroidism) cannot adequately produce these hormones. This medication helps pets with hypothyroidism to maintain normal metabolism in the body.

What results can I expect? Soloxine should be effective in replacing thyroid hormones in pets with hypothyroidism. It should relieve symptoms of this condition but it is not a cure. Different pets react differently to Soloxine. Periodic blood testing as directed by your veterinarian (usually every 2-4 weeks) to monitor thyroid function is usually necessary until the ideal dosage for your pet has been established. Regular blood testing as directed by your veterinarian will also be necessary at regular intervals in order to make sure your pet is taking the correct dose of Soloxine. Results are typically not immediate. It may take several weeks of treatment to see results. Your pet will likely need to take Soloxine or a similar thyroid supplement indefinitely in order to control his/her thyroid condition.

What Form(s) does Soloxine come in? Soloxine is available as a tablet. It is given orally (by mouth).

Generic Name: Levothyroxine (Common Drug Name)

Common Brand Name: Soloxine

Dose and Administration: Soloxine is given by mouth (orally) to dogs and cats. Birds can take this medication in their drinking water as directed by a veterinarian. This medication should be given with plenty of water and can be given with food. The dosage of Soloxine is different for each pet and is also based on body weight. Your veterinarian will determine the dosage of this medication that is best for your pet. Twice a day dosing is common but your veterinarian will tell you what is right for your pet. If you miss a dose of medication, give it as soon as you remember. If it time for the next scheduled dose, do not give two doses at once. Always contact your veterinarian if you are unsure of how to give this medication correctly. Blood testing is required every 2-4 weeks until the ideal dosage for your pet has been determined.


  • Daily medication can be given by mouth (orally) at home making administration easy.
  • Works to replace thyroid hormone in pets that suffer from hypothyroidism since they cannot produce these hormones independently.
  • Multiple concentrations available to allow for the most precise dosing for your pet.

Uses: Soloxine is used in the treatment of hypothyroidism which causes the thyroid gland to produce an inadequate amount of thyroid hormone. Soloxine contains Levothyroxine which helps to replace the hormones that pets with hypothyroidism cannot produce on their own.

Possible Side Effects: Soloxine is generally safe if it is given at the correct dose. Rarely, drowsiness, nausea, vomiting, and diarrhea can occur. Signs of an allergic reaction to this medication include facial swelling, hives, scratching, sudden onset of diarrhea, vomiting, shock, seizures, pale gums, cold limbs, or coma. If your pet displays any unusual symptoms once he/she has started taking Soloxine, contact your veterinarian immediately.

Drug and Food Interactions: Tell your veterinarian about any medications, supplements, or vitamins your pet is taking before starting Soloxine. Certain medications including antidepressants, sucralfate (Carafate), and aluminum antacids (Maalox, Mylanta) may affect the action of Soloxine or cause problems. Other drug interactions may also occur. If you are not sure if your pet’s medication can be safely given with Soloxine, contact your veterinarian for further information.

Precautions: Soloxine should not be used in animals hypersensitive (allergic) to it. It should also be used with extreme caution in older or debilitated animals, or in animals with heart disease, high blood pressure, Addison's disease (hypoadrenocorticism), or diabetes. Soloxine should never be used in pets suffering from hyperthyroidism which is a condition in which the body produces too much thyroid hormone.

A prescription from your veterinarian is required to purchase Soloxine.

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