Methimazole
Veterinary Compounding Medication – Customized for Cats (and select forms for Dogs)
Quick Reference
General Drug Information and Indications
Methimazole is an antithyroid medication used to manage hyperthyroidism in cats. It works by reducing thyroid hormone production (T3 and T4) to restore balance and prevent symptoms like weight loss, restlessness, and excessive appetite. It is often used as long-term therapy or to stabilize thyroid function prior to surgery or radioactive iodine treatment.
Available Compounded Forms
We compound in capsule form. Each capsule’s potency is verified through weight and yield checks to ensure precision. Ideal for long-term management of hyperthyroidism where accurate dosing is crucial.
Active Ingredient: Methimazole
Prescribed For: Cat
Condition: Hyperthyroidism
Soft chew treats are the perfect way to disguise medication. The tasty chews make dosing stress-free, and each is individually packaged for freshness and accurate dosing.
Active Ingredient: Methimazole
Prescribed For: Cat
Condition: Hyperthyroidism
Chewable tablets are available in natural chicken or fish flavors that pets love. These make administration easier for pet owners while maintaining dosage accuracy.
Active Ingredient: Methimazole
Prescribed For: Cat
Condition: Hyperthyroidism
Custom-compounded tablets provide veterinarians and owners with flexibility in dosing and administration. Available for both dogs and cats to meet a variety of therapeutic needs.
Active Ingredient: Methimazole
Prescribed For: Dog, Cat
Condition: Hyperthyroidism
Oral oil suspensions and solutions offer a convenient, palatable liquid dosage form. They can be administered directly by syringe or mixed with food. Flavor options and flexible dosing adjustments make it ideal for cats and small dogs.
Active Ingredient: Methimazole
Prescribed For: Dog, Cat
Condition: Hyperthyroidism
Oral pastes are formulated for precise dosing using a Dial-a-Dose syringe. Designed with optimal texture and flavors for easy administration in cats and larger pets.
Active Ingredient: Methimazole
Prescribed For: Cat
Condition: Hyperthyroidism
Familiar and flexible, oral suspensions are easy to administer and can be mixed with food. Available in multiple flavors for improved compliance.
Active Ingredient: Methimazole
Prescribed For: Cat
Condition: Hyperthyroidism
Flavored oral gels are dispensed via easy-to-use pens that deliver a tasty, precise dose. Ideal for small pets such as rabbits, rodents, or cats who resist other forms.
Active Ingredient: Methimazole
Prescribed For: Cat
Condition: Hyperthyroidism
Administration Tips
Dosage: Administer Methimazole exactly as prescribed by your veterinarian. It is often given once or twice daily depending on thyroid hormone levels.
Handling: Wash hands after handling. Avoid direct contact if you are pregnant or nursing, as Methimazole can be absorbed through the skin.
Side Effects
Common: Vomiting, loss of appetite, or mild lethargy when beginning treatment.
Less Common: Facial itching, anemia, or liver enzyme elevation. Contact your veterinarian if symptoms persist.
Precautions
Methimazole should be used only under veterinary supervision. Regular monitoring of thyroid hormone levels, liver enzymes, and blood cell counts is recommended. Use caution in pets with pre-existing liver, kidney, or bone marrow disease.
Drug Interactions
Methimazole may interact with anticoagulants, heart medications, and drugs affecting liver enzymes. Always provide your veterinarian with a complete list of your pet’s medications and supplements.
Overdose
Signs of overdose may include vomiting, weakness, or abnormal bleeding. Contact your veterinarian or the A.S.P.C.A. Animal Poison Control Center at 888-426-4435.
If ingested by a human, contact the National Capital Poison Center at 800-222-1222.
Storage
Store Methimazole in a tightly sealed container at controlled room temperature, away from light and moisture. Keep individual forms sealed or capped to preserve potency and flavor.
Custom Veterinary Compounding for Methimazole
Rock Ridge Pharmacy provides Methimazole in multiple convenient, pet-friendly forms — from capsules and chewables to flavored oral gels — to simplify thyroid care for your feline patients. Contact our veterinary compounding team to learn more about customized dosing and formulation options.
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