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Methimazole Suspension (Compounded) Rx

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Methimazole Suspension (Compounded)

Order online today or please call or e-mail VetRxDirect's compounding pharmacist at 866-761-6578 or if your veterinarian has prescribed any variation from the listed dose strengths or quantities of this compounded medication.

Beyond Use Date:

It is recommended that Methimazole suspension be used within 3 months.  Due to the shelf life of this product, please limit orders to an 80 day supply.
The (Flavor) of the compounded suspension is listed in parentheses at the beginning of the variation name.

Methimazole Suspension

If your cat suffers from hyperthyroidism, your veterinarian may prescribe Methimazole. This fast-acting medication treats the condition by slowing the production of thyroid hormone in the thyroid gland.


  • Fast treatment of hyperthyroidism in cats
  • Customized dosing based on your cat’s needs
  • Oral suspension comes in four varieties: chicken, fish, beef, or unflavored


Hyperthyroidism can cause your cat to loose weight, shed, and suffer from a variety of other uncomfortable symptoms. While the condition cannot be cured, it can be treated effectively with prescription Methimazole. This medication works by controlling hormone production in the thyroid gland. We ensure that your cat gets the right dosage by mixing the exact amount of Methimazole that your cat needs into a flavored oral suspension, which is easy to give to your pet.


What you should know about Methimazole:

  • Talk to your veterinarian before using this product.
  • Follow dosing directions exactly - don’t give your pet more medication than directed and don’t skip doses.
  • Read the label carefully for information about storage, possible side effects, and drug interactions.


For additional information about Methimazole, click the “More Information” and “Package Insert” tabs above. 


You can find a Client Information Sheet which provides a summary of information about Compounded Methimazole Suspension by following the link below:


Methimazole Client Information Sheet*


If you have questions or concerns about Compounded Methimazole Suspension, or conditions related to its use, contact your pet's veterinarian or pharmacist.


*This link opens in a new window.

Methimazole Transdermal Gel and Liquid Suspension

Medication Fact Sheet 


** This medication was custom compounded for you based on the prescription orders of your veterinarian.**


Description of this Medication:

Methimazole is used in the treatment of hyperthyroidism by inhibiting the production of the thyroid hormone in the thyroid gland.


How to Use this Medication:

The Transdermal Gel dosage form allows the medicine to be absorbed into the bloodstream through the skin of the animals ear.

  • Rub the prescribed amount of medication into the inside of the cat's ear where there is the least amount of fur.
  • Rub the gel in well using a protective finger cot.  Wash hands well following application of the medication.
  • There may be a residue remaining on the ear after the gel dries.  If a residue exists, it may be wiped off with a damp cloth or a cotton swab.
  • The gel may be stored at room temperature


The Suspension needs to be shaken well and is to be given orally using the oral syringe provided.


Normal Dosage:

The normal dosage of Methimazole is 1.25mg to 10mg given one-two times daily based on the prescribed volume to be administered.


Storage Requirements:

Store this medication at room temperature.  Protect from light.  Keep out of reach of children.


Beyond Use Date:

It is recommended that the Transdermal gel and the suspension be used within 3 months.  Do not keep medication beyond the use date.


Possible Side Effects:

Side effects of this medication are generally rare and may include anorexia, vomiting, lethargy, self-excoriation (clawing and biting), and excessive scratching of the face. 


Cautions and Warnings:

If side effects of the medication are noticed, consult your veterinarian or pharmacist.