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levothyroxine | Pet Medications

Price Comparisons for levothyroxine



Thyroxine L provides thyroid replacement therapy in all conditions of inadequate production of hormones produced naturally by the thyroid gland. Lack of thyroid hormone causes hypothyroidism, a common disease of middle age and older dogs.

For: Dogs & Cats



Levothyroxine/Thyroxine L is the generic form of Soloxine and NutriVed.

How it works: Thyroxine normally regulates many body processes. When the body is not producing enough of this hormone on its own, the condition is called hypothyroidism. Levothyroxine works like thyroxine to maintain normal metabolism in the body.

Dosage & Administration: Levothyroxine is given by mouth. If approved by your veterinarian, it may be given with food. Always follow the dosage instructions provided by your veterinarian. If you have difficulty giving the medication, contact your veterinarian.

Differences exist between brands. Do not change brands if possible. If there is a need to change, your veterinarian may need to recheck thyroid hormone levels and adjust dose if indicated.

This medication should only be given to the pet for whom it was prescribed.

Possible side effects of Levothyroxine: There are no known side effects when given at correct dosage.

If your pet experiences an allergic reaction to the medication, signs may include facial swelling, hives, scratching, sudden onset of diarrhea, vomiting, shock, seizures, pale gums, cold limbs, or coma. If you observe any of these signs, contact your veterinarian immediately.

If you miss giving a dose: If you miss a dose, give it as soon as you remember. If it is almost time for the next dose, skip the one you missed and go back to the regular schedule. Do not give two doses at once.

If you overdose the pet: With chronic overdosing (taking a slightly higher dose over a long period of time), expect to see signs of hyperthyroidism such as an increase in drinking, urinating, eating, activity; seeking cool areas; increased heart rate; panting; restlessness; and behavior changes. You may also see vomiting.

If you know or suspect your pet has had an overdose, or if you observe any of the above signs in your pet, contact your veterinarian immediately.

What should I avoid while giving Levothyroxine to my pet: Consult with your veterinarian before using this medication with any other medications, including vitamins and supplements, epinephrine, norepinephrine, insulin, estrogens, warfarin, or digoxin, since interactions may occur.

No known food interactions.


Who should not take it? Not for use in animals hypersensitive (allergic) to it. Use with extreme caution in older or debilitated animals, or those with heart disease, high blood pressure, Addison's disease (hypoadrenocorticism), or diabetes.

Do not use in animals with hyperthyroidism, a condition in which the body produces too much thyroid hormone.

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