Hover image to zoom Tap and hold image to zoom
Refills on File
Your pet {{refill.petName}} has {{refill.refillsRemaining}} refill{{refill.refillsRemaining>1?'s':''}} for ‘{{refill.options}}’ which will expire on {{refill.expiresOn}}.
{{refill.petName}}'s refills for this have expired on {{refill.expiresOn}}
At a Glance
Effective in fighting hyperthyroidism, or Graves disease
Reduces overall thyroid hormone levels
Comes in tablet form and taken orally


List Price:
{{list_price * quantity | currency}}
List Price:
{{list_price * quantity | currency}} {{(list_price + 0.01) * quantity | currency}}
List Price:
{{list_price * quantity | currency}}
List Price:
See price in cart
List Price: {{list_price * quantity | currency}}
25% OFF w/code: CARE25
PetPlus Price:
{{petplus_price * quantity |currency}}
PetPlus Price:
See price in cart
Sale Price:
{{sale_price * quantity|currency}}w/code {{siteCode}}
Your Price:
{{map_price + 0.01 | currency}} See price in cart w/code {{siteCode}}
{{petplus_savings_amount * quantity|currency}} ({{petplus_savings_percent}}%)
{{coupon_savings_amount * quantity|currency}} ({{coupon_savings_percent}}%)
Join PetPlus today and get this for {{intro_price_total|currency}}
Join PetPlus today and {{use_strict_map_rules?"see price in cart":"get this for a special price"}}

inlowout of stock
Get notified as soon as this becomes available
Thank you.
We will email {{notifyEmail}} when this is back in stock.
Recommended Alternatives:
Limit ( {{ selected_sku_data.cartLimit }} ) per customer. Orders for more than this may not be fulfilled.
Shipping is always free with PetPlus | Arrives in 1-3 days on average
Free shipping over $48* | Arrives in 1-3 days on average
Select Autoship options at checkout
At a Glance
Effective in fighting hyperthyroidism, or Graves disease
Reduces overall thyroid hormone levels
Comes in tablet form and taken orally

Frequently Bought Together

Total Price

Methimazole is an anti-thyroid tablet administered for the treatment of hyperthyroidism in cats. Hyperthyroidism, often known as Graves disease, is an autoimmune disease that causes hyperactivity within the thyroid gland leading to the overproduction of the thyroid hormones thyroxine (T4) and triiodothyronine (T3). Metehimazole is the generic of Tapazole.

Hyperthyroidism is a condition that may lead to weight loss, abnormal appetite, and heart issues. In this instance, the medication works by restoring the thyroid hormone levels back to normal by interfering with iodine, which plays a major role in thyroid performance. Overall, Methimazole has been proven incredibly effective against Graves disease in cat's.

Though it is generally safe when administered under the direction of a veterinarian, methimazole can cause have side effects in some animals. Adverse effects include frequent bouts of vomiting, lack of appetite, weakness, bleeding disorders, or liver problems.

  • Thyroid Pharmacy
  • King Pharma Manufacturer
  • Oral Application
  • Cat Pet Type


Side effects occur in less than 5% of all cases, but can be serious, such as a decreased white blood cell count (agranulocytosis); contact a veterinarian immediately if your pet display signs of a sore throat. Excessive bleeding can also occur as a result of a decrease in blood platelets. Very rarely, liver failure and its ensuing complications have been associated with Methimazole.

More common side effects are skin-related, including rash, itching, hives, abnormal hair loss, and skin pigmentation. Other side effects may include swelling, nausea, vomiting, heartburn, loss of taste, joint or muscle aches, drowsiness, dizziness, numbness, and headache. Do not use in pregnant or nursing animals.

Methimazole must be used only in cats. It should never be used on animals, which are prone to allergy to the drug. Extreme care should be taken while using this medication in animals with a known history of liver impairment, immune-system disease or blood disorders. Regular blood tests to monitor toxicity on blood cells and liver are suggested in cats, which are on methimazole for a long period.The medication should be administered life long as the symptoms might reappear once the medication is stopped. It is advisable to use methimazole for the short term management of the disease as it involves side effects. Surgical removal of the thyroid gland or radiation treatment would be more appropriate for a lasting solution. Pregnant and nursing cats should not be given this drug. Drug overdose might result in blood disorders or liver toxicity.ย 

Do not take with theophylline (Theo-Dur), warfarin (Coumadin), digoxin (Lanoxin), a beta blocker such as atenolol (Tenormin), metoprolol (Lopressor), or propranolol (Inderal). Talk to your vet before starting any serious treatment plan.

Methimazole is an anti-thyroid tablet used in the treatment of hyperthyroidism in cats, which, might result in weight loss, abnormal appetite and heart problems. When administered, methimazole restores the thyroid hormone levels back to normal by interfering with iodine, which has a major role in thyroid function.ย 

Methimazole comes as 5 mg and 10 mg tablets. The recommended primary dose of methimazole is 5 mg per cat, three times daily and the dosage should be increased, if no improvement is noticed in the situation. Once the condition stabilizes, the dose could be reduced after taking the opinion of the veterinarian. Ensure that the full course is completed to prevent relapse or the chances of developing resistance to the drug.ย 

Ask your veterinarian or consult with one of our pet care specialists at 1-800-844-1427.

This information is for informational purposes only and is not meant as a substitute for the professional advice of, or diagnosis or treatment by, your veterinarian. Always seek the advice of your veterinarian or other qualified professional with any questions you may have regarding a medical condition. Never disregard or delay seeking professional advice due to what you may have read on our website. Our medications are FDA approved and/or EPA regulated when and as required by law.

Methimazole comes as an oral tablet. Be sure to administer medication with food and water two to three times a day (or every eight hours). A blood test will be conducted by your veterinarian to determine proper dosage levels. Do not use in pregnant or nursing animals

Store methimazole at room temperature, between 68 and 77° F (20 and 25° C). Brief storage at temperatures between 59 and 86° F (15 and 30° C) is permitted. Store away from heat, moisture, and light. Do not store in the bathroom.

Methimazole is manufactured by King Pharma

How to Order Prescriptions Online

1. Find the Right Product

Make sure it matches your pets prescription. Donโ€™t forget to compare the dosage for pills/capsules!

2. Add to Cart

Just like any other online store. Make sure the quantity matches whatโ€™s been prescribed by your vetinarian.

3. Tell Us About Your Pet and Vet

Answer some questions during checkout and weโ€™ll contact your vet and verify the prescription for you. You can also mail us the written prescription.

4. Thatโ€™s It!

If the prescription has any refills, processing your future orders for that medication can be expedited.

Related Articles

Frequent Urination in Cats: Causes and Treatment

How To Manage Frequent Urination In Your Cat

Read More
Miscarriage in Cats: A Detailed Guide

Coping with Miscarriage in Cats

Read More
Electrolyte Imbalance in Cats: Causes, Symptoms, and Treatment

Recognizing and Treating Electrolyte Imbalance In Cats

Read More

Customer Reviews

Overall Rating

5 / 5
* = required

New Product Review

Uploaded Image 1
Uploaded Image 2
Uploaded Image 3
  • {{error}}
Showing 1 - {{visible_reviews.length}} of 35

This product has no reviews yet. Write a review.

Page 1 of 1 1