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Felimazole [Methimazole] treats hyperthyroidism in cats, a condition in which too much thyroid hormoneis produced. It will not cure the disease, but will usually control it if given for the rest of the cat's life
The generic form of Felimazole is methimazole
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Item# Size/Desc Qty Price
2.5 mg Tablet 100 cnt bottle
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2.5mg per Tablet
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5 mg Tablet 100 cnt bottle
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5 mg per Tablet
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**Note: This product requires a veterinarian's prescription to purchase.At checkout you will need to provide your veterinarian's FAX or email address. We will then send him or her a prescription verification that he or she will need to sign and return before we can ship you this product.


*  Controls the symptoms of hyperthyroidism for an improved quality of life

*  Treats hyperthyroidism without surgery or anesthesia

*  Available in a dosage size specifically for cats

*  It comes as a coated tablet for easy administration

Dosage and Administration:

Follow your veterinarian's dosage instructions carefully.

Felimazole tablets are given by mouth. Methimazole, the active ingredient, is very bitter. Felimazole comes as a coated tablet for ease of administration.
Do not break or crush the tablet.
If you have difficulty giving the medication, contact your veterinarian. Wash hands with soap and water after giving the medication.

Blood levels of thyroid hormone will be checked by your veterinarian at regular intervals, and the dose increased or decreased as needed. The lowest effective dose should be used.

This medication should only be given to the pet for whom it was prescribed


*  Talk to your veterinarian about what tests and exams may be necessary while your pet is taking Felimazole.
*  Talk to your veterinarian about what type of outcome is expected.
*  Have your veterinarian explain the other treatment options for hyperthyroidism in cats.
*  In addition to monitoring of thyroid hormone levels, laboratory tests to check liver and kidney function and blood cell counts may be performed before starting treatment and then regularly thereafter.
*  Tell your veterinarian if your pet has a blood disease, liver disease, or autoimmune disease or may be pregnant, is nursing, or if you intend to breed your pet.
*  Notify your veterinarian of any other medications or supplements your pet is taking, and also if your pet has had any reactions to previous medications

*  Not for use in pets who are hypersensitive allergic to it.
*  Use with extreme caution in pets with anemia, clotting disorders, bleeding, low white cell and platelet counts, or diseases of the immune system, liver, or kidney.

*  The manufacturer recommends that Felimazole should not be used in pregnant or lactating animals females nursing their young.

*  Methimazole can cause birth defects. Pregnant women should be extremely cautious in handling this medication or the waste products from a cat receiving Felimazole.

* Treatment with methimazole may unmask hidden kidney disease. 

Possible Side Effects:
Side effects are most common during the first 3 months of treatment

*   If you observe any of the effects listed below, contact your veterinarian.

*   May see changes in appetite, vomiting, diarrhea, skin lesions, lethargy, or abnormal vocalization. These usually occur within the first two weeks of treatment and may stop even with continuation of treatment.

*  Less common side effects include liver problems resulting in the above signs plus yellowing of the gums, skin, or eyes itching of the face, resulting in scratching bleeding tendencies swollen lymph nodes anemia and low white blood cell counts. Your veterinarian will determine if these effects necessitate stopping the medication and treating with surgery or radioactive iodine therapy.

*  If your pet is unusually tired, has a fever temperature over 103°F, or shows signs of bruising or bleeding, contact your veterinarian immediately.

*  If your pet experiences an allergic reaction to the medication, signs may include facial swelling, hives, scratching, sudden onset of diarrhea, vomiting, shock, seizures, pale gums, cold limbs, or coma. If you observe any of these signs, contact your veterinarian immediately