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Levothyroxine

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Product Info

What is Levothyroxine - Generic to Soloxine?

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.

For:

Dogs (Used in cats in certain circumstances)

Benefits:

  • Is the active ingredient in Soloxine
  • Treats conditions associated with hypothyroidism
  • Easy to administer

How does Levothyroxine work?

Levothyroxine provides thyroid replacement therapy to pets with hypothyroidism or other thyroid conditions due to low circulating thyroid hormone.

Cautions:

Keep out of reach of children. Administer with caution to animals with primary hypertension, euthyroidism and clinically diagnosed heart disease.

Brand Name:

Soloxine (Virbac), Levotabs (Vetus), Synthroid (Knoll), Thyrosin (Vedco), Thyro-Tabs (Vet-a-Mix)

Generic Name:

Levothyroxine

What is the most important information I should know about Levothyroxine?

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).

How should Levothyroxine be given?

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.

What happens if I miss giving a dose of Levothyroxine?

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.

What happens if I overdose my pet on Levothyroxine?

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.

What should I avoid while giving Levothyroxine?

Different brands of levothyroxine may not work the same. If the pills look different from the last filling, speak to your pharmacist or veterinarian.

What are the possible side effects of Levothyroxine?

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.

What other drugs will affect Levothyroxine?

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.

How to Use

Levothyroxine Directions:

  • Levothyroxine is used to treat hypothyroidism or low thyroid hormone.
  • Periodic blood tests are necessary to measure thyroid hormone levels.
Tip:

Allow plenty of water for the pet to drink. Levothyroxine may be given directly or placed in your pet's food.

Levothyroxine Dosage for Dogs:

Dogs:
WeightDosage
All weightsThe usual dose in dogs is 0.1 mg per 10 lbs of body weight given twice a day typically although some dogs are dosed once a day
All weightsThe usual dose is 0.05-0.1 mg per cat.
Levothyroxine Dosage for Horses:
Horses
Do not use!
Storage:

Store at room temperature away from moisture and heat.

Ingredients

Levothyroxine Ingredients:

Levothyroxine Sodium 0.1 mg Tablets:
IngredientStrength
Levothyroxine Sodium0.1 mg
Levothyroxine Sodium 0.2 mg Tablets:
IngredientStrength
Levothyroxine Sodium0.2 mg
Levothyroxine Sodium 0.3 mg Tablets:
IngredientStrength
Levothyroxine Sodium0.3 mg
Levothyroxine Sodium 0.4 mg Tablets:
IngredientStrength
Levothyroxine Sodium0.4 mg
Levothyroxine Sodium 0.5 mg Tablets:
IngredientStrength
Levothyroxine Sodium0.5 mg
Levothyroxine Sodium 0.6 mg Tablets:
IngredientStrength
Levothyroxine Sodium0.6 mg
Levothyroxine Sodium 0.7 mg Tablets:
IngredientStrength
Levothyroxine Sodium0.7 mg
Levothyroxine Sodium 0.8 mg Tablets:
IngredientStrength
Levothyroxine Sodium0.8 mg
Levothyroxine Sodium 1.0 mg Tablets:
IngredientStrength
Levothyroxine Sodium1.0 mg
Customer Reviews
Levothyroxine is rated 4.2 out of 5 by 6.
Rated 4 out of 5 by from Medication is great. Took a long time to get. Out dog, Maddie, has been on this medication for years. We moved from our Vet to 1800petmeds about 6 months ago without a problem. Last month she had blood work and the dose needed to be changed. Our Vet was contacted, but they did not respond. There was a mix up at their office, and I didn't get notified that the Vet had returned the prescription stating there was no owner/pet by that name. When I realized this 2 weeks later, I called 1800petmeds and they resent it to the Vet and I also called them to alert them of the request. I asked 1800petmeds if they could overnight my shipment as we were now out of medication and they adjusted shipping at no extra charge.
Date published: 2016-12-21
Rated 5 out of 5 by from Easy...easy...easy Never a problem and very cordial people to work with.
Date published: 2016-12-14
Rated 5 out of 5 by from A good alternative to Soloxine. Soloxine has been out of stock for a lengthy amount of time and this has been an adequate replacement. My dog's weight is still low and I haven't noticed any side effects except for increased water consumption which I'm not concerned about.
Date published: 2016-05-15
Rated 5 out of 5 by from Generic just as good as Soloxine.... I've been giving this drug to my sweet golden (Buster) since I first discovered it's the generic equivalent of Soloxine, which seems to run out of stock more often than not. Also, I personally take this same medication for hypothyroidism, and I trust both my primary care physician and Buster's vet without question. I have faith that both are providing us with excellent care.
Date published: 2016-04-21
Rated 5 out of 5 by from Very helpful My Sheltie"s skin, disposition, and energy level are back to a more normal and healthy state. Lucky for me she was diagnosed with low thyroid because it made me address my low energy concerns. We are both basically on the same medication and are both doing very well.. Of course mine is from a Doctor and not a vet. This is a life time drug and I believe it works well.
Date published: 2015-08-12
Rated 1 out of 5 by from Don't like...... The medication seems to cause my friend's (Chocolate Lab/Pokie) muscles to deteriorate. I can not afford another blood panel so soon and was advised to keep him on same meds but can't when they are out.
Date published: 2015-07-20
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Q&A

Hi, my name is Sebastian. My dog Leo has to take a 1 1/2 tablet of Levothyroxine 0,8 per day. I wan to buy 1000 pills, but I need to know what is the expire time of the Levothyroxine 0,8, because I need the pills last at least 2 years. Thank you

Asked by: Sebas
Thank you for your inquiry. The expiration date for the current Levothyroxine in stock as of today is June 2019. Depending on when you wish to place the order we recommend contacting us at 1-800-738-6337 for the up to date information before placing the order.
Answered by: Crystal PetMed Pro
Date published: 2018-01-03

Do you need prescription from the vet to order? Our Vet was quite expensive in comparison to what they were in NM but said not to trust meds on 1800petmeds, but I think that’s just so we have to buy it through them. 

Asked by: Abrown0727
Thanks for your question. Yes, you will need a prescription from your vet to order this medication. We are a high quality pharmacy for pet medications and have many pharmacists on staff ensuring your pet's safety. We're glad you're considering us for your pet's medications.
Answered by: Adriane
Date published: 2017-12-12

Is this the same medication as Thyroxine?

Asked by: Jenna
Thank you for your question. Levothyrozxine is the genric to Soloxine (Virbac), Levotabs (Vetus), Synthroid (Knoll), Thyrosin (Vedco), Thyro-Tabs (Vet-a-Mix).
Answered by: Crystal PetMed Pro
Date published: 2017-10-30

Is Soloxine FDA approved? My vet prescribed this medication but all the info I found is as of 2016 is was not FDA approved. Should vets still be Prescribing this?  I know the  composition is all the same for all the  thyroid mfgs. 

Asked by: John L
We carry Thyro Tabs as our brand of levothyroxine which is FDA approved. Consult your veterinarian regarding your concern about Soloxine.
Answered by: Lisa M
Date published: 2017-09-29

What milligram tablet of Levothyroxine do I give my hundred pound dog

Asked by: Jennifer
The typical dose is 0.1mg per 10lbs of body weight twice a day. This would put your pup at 1mg twice a day however, I would recommend speaking with your veterinarian as he will likely run blood testing prior to dosing your pet.
Answered by: Megan Student Pharmacist
Date published: 2017-07-20

Your recommended dose is .1 mg per ten pounds. Is that per day or twice a day as my vet has prescribed? My Beagle is 27 lbs. and is taking half of a .7 mg twice a day.

Asked by: Garebear
Hello there, the usual dose in dogs is 0.1 mg per 10 lbs of body weight given twice a day typically although some dogs are dosed once a day. Hope this helps!
Answered by: Nemi Pharmacy Intern
Date published: 2017-05-30

Can this med cause dry flaky skin on a dog

Asked by: Terri
Hello Terri, Thanks for reaching out! Symptoms of flaky or dry skin on a dog is associated with hypothyroidism, which is the condition that this medication treats. You should see that these symptoms will begin to improve about 6 weeks after starting this medication. If the dog has been on this medication for a long time, and you just started noticing these symptoms, it could mean that the strength is no longer appropriate for him. If that's the case, my best suggestion would be to talk to your vet and test the dog to confirm that he is getting the appropriate dosage of this medication. Hope this helps!
Answered by: Nemi Pharmacy Intern
Date published: 2017-09-17

My dog takes thyroxine 0.2 mg daily. Can you supply this dose?

Asked by: Vicky
Thank you for your question Vicky. We do offer the Levothyroxine in the .2mg strength.
Answered by: Crystal PetMed Pro
Date published: 2017-05-19
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