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Methimazole
Methimazole (Click for Larger Image)  

Methimazole is used by veterinarians to treat overactive (hyper) thyroid in cats. It is available as a 5mg scored tablet. The usual dose is 1 tablet every 8-12 hours. Blood tests must be done to check proper dosage. Do not use in pregnant or nursing animals. (sold per tablet)

This product requires a prescription Click for Information
Methimazole 5 Mg Tab #10491 $0.45
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Brand Name
Tapazole (Jones)
 
Generic Name
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 żliveż 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.

What is Methimazole: Methimazole prevents the thyroid gland from producing too much thyroid hormone. Methimazole is used to treat overactive thyroid (hyperthyroidism). It is also used before thyroid surgery or radioactive iodine treatment. Methimazole may also be used for purposes other than those listed in this guide.

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.

How should this medication 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 happens if I miss giving a dose: Give the missed dose as soon as you remember during the same day. However, if you donżt 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 happens if I overdose the pet: Seek emergency veterinary medical treatment. Symptoms of methimazole overdose may include nausea, vomiting, upset stomach, joint pain, headache, fever, itching, swelling, and easy bruising or bleeding.

What should I avoid while giving Methimazole to my pet: Do not give the pet a żliveż vaccine while the pet is taking methimazole. Contact your veterinarian at once if your pet develops signs of an infection.

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 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.

Where can I get more information: Your pharmacist has additional information about methimazole written for health professionals that you may read.



This information sheet is for educational purposes only and is intended to be a supplement to, and not a substitute for, the expertise and professional judgment of your veterinarian. The information is NOT to be used for diagnosis or treatment of your pet. You should always consult your own veterinarian for specific advice concerning the treatment of your pet.
 
The information is not intended to cover all possible uses, directions, precautions, warnings, allergic reactions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for your pet. It is not a substitute for a veterinary exam, and it does not replace the need for services provided by your veterinarian.
 
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