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Methimazole

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$0.69 $0.46 per tablet
Ships in one business day or less

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5 mg Tablets
$0.69
$0.58
$0.46
Price w/coupon SAVE20
$0.69 $0.46 per tablet
Ships in one business day or less

Step 1. Select a Tablet Size:

5 mg Tablets
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$0.58
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Product Info

What is Methimazole?

Methimazole is used to treat hyperthyroidism in cats. Methimazole is used to treat overactive thyroid (hyperthyroidism). It is also used before thyroid surgery or radioactive iodine treatment. It has largely replaced propylthiouracil in this treatment process since it has a lower incidence of adverse side effects. Methimazole requires a prescription from your veterinarian, and is sold per tablet.

For:

Cats

Benefits:

  • Effectively treats hyperthyroidism in cats
  • Rapid results
  • Affordably sold per tablet

How does Methimazole work?

Hyperthyroidism is a condition that occurs when the thyroid gland produces too much thyroid hormone. Methimazole inhibits the production of thyroid hormones.

Cautions:

Blood tests must be done to check for proper dosage. Do not use in pregnant or nursing animals. Do not give your pet a live vaccine while giving methimazole. Contact your veterinarian immediately if your pet develops signs of an infection.

Brand Name:

Tapazole (Jones)

Generic Name:

Methimazole

What should I discuss with my veterinarian before giving Methimazole to my pet:

Tell your veterinarian if your pet has an allergy to methimazole or if your pet has liver disease, a blood cell disorder, or a weak immune system. Tell your veterinarian if the pet is pregnant or nursing. Inform your veterinarian of any other medications, including vitamins and supplements your pet may be taking while receiving methimazole.

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

Methimazole is a prescription medication not FDA approved for veterinary use; however, it is a commonly accepted practice for veterinarians to use this medication in cats. Methimazole is available as a 5mg scored tablet. The usual initial dose for cats is 5mg every 8 to 12 hours. Do not give methimazole to pregnant or nursing animals. Methimazole can increase the risk of bleeding. Methimazole can lower the blood cells that help fight infections. Your veterinarian will need to give blood tests on a regular basis to be sure these blood cells do not get too low. Do not give the pet a "live" vaccine while the pet is taking methimazole. Methimazole is needed for the life of the pet. If the medication is stopped, the symptoms will reappear.

How should Methimazole be given?

Give this medication exactly as directed by your veterinarian. Do not give in larger amounts, or give it for longer than recommended by your veterinarian. Follow the directions on the prescription label. If you do not understand the directions ask the pharmacist or veterinarian to explain them to you. Methimazole can be given with or without food. Allow plenty of water for the pet to drink. Store methimazole at room temperature away from moisture and heat. Keep this medication away from children and pets.

What are the possible side effects of Methimazole?

If any of the following serious side effects occur, stop giving methimazole and seek emergency veterinary medical attention; an allergic reaction (difficulty breathing; swelling of the lips; tongue or face; hives). Stop giving methimazole and contact your veterinarian at once if your pet develops any of these serious side effects; fever, chills, body aches; easy bruising or bleeding, unusual weakness; blood in the urine or stools; severe blistering, peeling, and skin rash; nausea, low fever, loss of appetite, dark urine, jaundice. Other less serious side effects may occur. Continue giving methimazole and talk to your veterinarian if your pet experiences headache, drowsiness, dizziness; mild nausea, or vomiting; itching; muscle, joint, or nerve pain; swelling; hair loss. Other side effects may also occur. Talk to your veterinarian about any side effect that seems unusual or bothersome to the animal.

What happens if I miss giving a dose of Methimazole?

Give the missed dose as soon as you remember during the same day. However, if you don't remember until the next day, skip the dose you missed and give only the next regularly scheduled dose. Do not give a double dose of the medication.

What should I avoid while giving Methimazole to my pet?

Do not give the pet a "live" vaccine while the pet is taking methimazole. Contact your veterinarian at once if your pet develops signs of an infection.

What other drugs will affect Methimazole?

Tell your veterinarian if your pet is taking theophylline (Theo-Dur), warfarin (Coumadin), digoxin (Lanoxin), a beta blocker such as atenolol (Tenormin), metoprolol (Lopressor), or propranolol (Inderal). Drugs other than those listed may also interact with Methimazole. Talk to your veterinarian or pharmacist before giving any prescription or over the counter medicines.

How to Use

Methimazole Directions:

  • Methimazole is a prescription medication used by veterinarians to treat overactive (hyper) thyroid in cats.
  • Methimazole is not FDA approved for use in veterinary medicine; however, it is a commonly accepted practice for veterinarians to prescribe this medication for cats.
  • Methimazole is also used before thyroid surgery or radioactive iodine treatment.
  • Periodic blood tests will be necessary while the cat is taking this medication.
Tip:

Do not use in pregnant or nursing animals. Methimazole can be given with or without food.

Methimazole Dosage for Cats:

Cats:
WeightDosage
All weightsThe usual initial dose varies from 2.5-5mg 2 or 3 times a day. Periodic blood testing is required to monitor liver function and for any toxic effects on blood cells
Methimazole Dosage for Dogs:
Dogs
Do not use!
Methimazole Dosage for Horses:
Horses
Do not use!
Storage:

Store methimazole at room temperature, away from moisture and heat.

Ingredients

Methimazole Ingredients:

Methimazole
Active Ingredients (per tablet)Amount
Methimazole5 mg
Other Ingredients: Lactose Monohydrate, Povidone, Talc, Croscarmellose Sodium, Magnesium Stearate, Corn Starch.
Customer Reviews
Methimazole is rated 4.6 out of 5 by 118.
Rated 5 out of 5 by from Saved my cat's life After our vet diagnosed my cat with thyroid disease, he was prescribed the liquid form of methimazole. This caused digestive problems, so the vet switched to pills. My cat is back to the cuddly sweet pet I know. The medicine has made a huge difference. And 1800PetMeds helped me save money on the medicine.
Date published: 2017-12-10
Rated 4 out of 5 by from .. It helps .... was put on this by my vet for my 13 yr old kittty....first was a half twice a day...but now after a recent blood test, have to give whole tab. twice a day...breakfeast and dinner is when I give it....I crush it to a powder, which I don't think the vet says to do it, but as we all know how hard it is for cats to take pills....this is the only way that works best for us...I then put it into baby food - chicken is her fav. made of only cornstarch and water, if its good for a baby its good for pets too...and she loves it and never notices the meds...yes they want routine blood tests, which I just can't bare to do to her, makes me queasy for her..have done it twice already....so I say no to that....and the only cure for this thyroid problem is to remove the thing....which at this point in her senior years, I just won't do to her....she does not have much time left and is doing well.....though she is still always hungry and I do try to feed her as needed and what ever she wants - heck I even give her a big steak bone to chew on for her frustrations...I also bought her an electronic water fountain which she is OBSESSED with....for she is always thirsty....she was a big kitty at one time....but has lost weight and was very hyper....she has calmed down alot since the meds. though her weight is still low and her numbers are a little high still....but I know there's a difference since the meds...not perfect...but its something to help her with this condition....thank god that's all it is....
Date published: 2017-12-09
Rated 5 out of 5 by from Life changer Since my cat is taking it daily (hidden in Greenies Pill Pockets)my cat is a happy healthy 18 year old. His fur is shiney again and he's generally a more relaxed cat. He was off the wall before.
Date published: 2017-10-08
Rated 5 out of 5 by from Relieves Symptoms We started my cat on 1/2 of 5mg. twice a day, to help with his hyperactive thyroid. That raised his T3 slightly. Bumped script up to 1/2 tab 3x day. That helped slightly more. Now he's on 1 full tab at morning and 1 full at evening. His level is up to a low normal reading. When cats have hyperactive thyroid they are constantly hungry. We discovered you NEED to feed them. They are not being annoying, they are literally starving to death! Some days my cat eats 3 cans of Fancy feast but averages 2 cans a day. He had lost over 3 lbs. and continued to loose until we fed him whenever he asked. He has gained almost 2 lbs back, looks great and got a good vet report. I feel both vets ( Mi and FL) would have helped my cat more had they told me to FEED him when he asks, as well as raised the dose of Methlimazole.
Date published: 2017-05-21
Rated 5 out of 5 by from Worksgreat My cat went from 16 to 10 lbs.. Thyroid problems she took methamozola and she is great, back to 16 lbs.. And so happy and at 15-16. She starting yo play again like a kitten
Date published: 2017-01-20
Rated 5 out of 5 by from Happy Kitty Again My 16 year old cat is hyperthyroid and had lost a few pounds despite her voracious appetite. She stopped purring and was lethargic and ill. The doctor put her on 5 mg twice a day, and in just one month she has gained a whole pound and her blood test numbers are much better! She is acting more like her old self too. I crush the pill and mix it with Fancy Feast and she doesn't even seem to notice it. Love this stuff!
Date published: 2016-06-22
Rated 5 out of 5 by from Works well I was originally getting the "mini-melt" variety from my vet, but a friend told me about 1800petmeds. Even though this isn't the mini-melts, they still work well. I soften it in a little bit of warm, lactose-free milk then crush it and mix it up and Oreo thinks it's his special treat. The only downside is that they come in 5mg pills, which mean I have to cut one in half for his evening dose. But it's working well and he's gaining weight and looking healthy again.
Date published: 2016-05-01
Rated 5 out of 5 by from Worked Fast Kitty started losing weight and was diagnosed with hyperthyroid. The pill treatment was the best option for us and it has worked really well. She started gaining weight within a week. The delivery was very quick, I had the medication within 3 days with very little effort on my part. This is also a lot cheaper then buying though the vet office.
Date published: 2016-02-03
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Q&A

My 14 Y/O male cat was just put on methimazole for hyperthyroidism.  2 questions:  1,he is only 8 lbs, is the dose still 5mg.? 2, he will be staying with an elderly care giver who will be unable to give him his dosage for 4 days. Is this a problem?

Asked by: Seven
The usual initial dose varies from 2.5-5mg 2 or 3 times a day. The dosing and frequency is determined by the veterinarian. Methimazole is generally needed for the life of the pet. If the medication is stopped, the symptoms will reappear. We recommend consulting with the veterinarian before going days without the medication.
Answered by: Crystal PetMed Pro
Date published: 2017-10-25

Does this medicine make you gain weight

Asked by: Kathy
Weight gain is not listed in the side effects.
Answered by: Cherley Petmeds Pro
Date published: 2017-08-30

My cat just started this medication. I give her half a pill in morning and another half 12 hours later. My vet told me to wear gloves because this medicine can affect my thyroid! Is that right? And if so, how careful do I have to be?

Asked by: Lena37
Thank you for your question. Methimazole inhibits the production of thyroid hormones. Listen to your veterinarians instructions.
Answered by: leanniejo
Date published: 2017-11-03

How much is tuna flavored liquid?

Asked by: Poppyphil
We have the medication available compounded and we do offer the tuna flavor. You are not charged additional for flavoring the medication. The cost however is determined by the dosage needed.
Answered by: Crystal PetMed Pro
Date published: 2017-08-20

Can I take biotin with methimazole

Asked by: Maumau
Hello, there are no reported drug interactions with biotin and methimazole. However, it is best to speak to your Vet before giving your pet any over the counter products, such as biotin.
Answered by: Roseanna Pharmacy Intern
Date published: 2017-05-03

Within minutes of my giving my cat her 5 mg pill, she ate the 5 mg pill I had put in a pill pouch treat that I had been trying to get her to eat for 20 minutes. So, she ended up with 2 pills or 10 mg. What should I do?

Asked by: Scooter
Your cat should be ok. Higher doses have been used in cats that are safe. Stop giving methimazole and contact your veterinarian at once if your pet develops any of these serious side effects; fever, chills, body aches; easy bruising or bleeding, unusual weakness; blood in the urine or stools; severe blistering, peeling, and skin rash; nausea, low fever, loss of appetite, dark urine, jaundice.
Answered by: Ben B
Date published: 2017-09-23

I am giving my cat the gel of methimazole. Is there any side effects to me if I get the med on my skin? Thank you

Asked by: Mellowmayo
In order to reduce any possibilities of side effects you can wear gloves to apply. Pregnant or nursing women should wear gloves as side effects are a possibility, but are less than the pill form. This could cause vomiting.
Answered by: Ben B
Date published: 2017-11-03

Hello. Im giving my pet 2.5 mg transdermal pen twice a day. Do you have that amount? And my vet said if i did pills i could not crush them up. Although im reading alot of reviews that say they crushed em up. 

Asked by: Kmbr93
We do carry a transdermal dosage form of this medication that can be dosed out for 2.5mg
Answered by: S Duesler PharmD MBA
Date published: 2017-11-03
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