Product details
Felimazole Coated Tablets (methimazole tablets) for Cats are indicated for the treatment of hyperthyroidism in cats.
This product is a coated tablet formulation.
- Felimazole Coated Tablets contain methimazole, an antithyroid drug that blocks the production of thyroid hormones.
- Easy dosing with two tablet strengths.
- Small sugar-coated tablets for ease of administration.
- Affordable treatment option for cats with hyperthyroidism.
- Do not administer to pregnant or lactating animals; wear gloves or avoid handling if you are pregnant, nursing, or planning to become pregnant.
Felimazole treats feline hyperthyroidism, a commonly diagnosed disease in senior cats. The disease results in excess levels of thyroid hormone being produced in the thyroid gland. Symptoms can include weight loss, increased thirst and urination, vomiting, and excess activity.
This product contains a chemical on the Prop 65 List.
*Please note: The images provided are for illustrative purposes. Your product may be delivered in a Vetsource Pharmacy vial; product packaging & appearance may vary and are subject to manufacturer availability.
Product sourced directly from the manufacturer or their approved distributor. Guaranteed genuine product backed by the manufacturer.
For
Cats
Active ingredient(s)
Methimazole
Inactive ingredients
Complete inactive ingredients list not provided by manufacturer.
Brand name
Felimazole Coated Tablets
Drug class
Antithyroid agent
Manufacturer
Dechra Veterinary Products
Product strength & size
Felimazole Coated Tablets may be available in multiple strengths and/or sizes. Please ensure the selected product and package size are appropriate for your pet, as recommended by your veterinarian.
For current availability, please refer to the product selection above.
Usage
*For complete product information, please review the full prescribing information in the manufacturer package insert.
Felimazole Coated Tablets should be given orally as directed by your veterinarian. Please consult your veterinarian before making any changes or discontinuing the prescribed dosing schedule. Your veterinarian will monitor your pet’s bloodwork while taking this medication.
Do not break or crush tablets. Wear protective gloves to prevent direct contact with litter, feces, urine, or vomit of treated cats, and broken or moistened tablets. All pet owners should wash their hands thoroughly with soap and water after handling the medication or if contact is made with the litter or bodily fluids of a treated cat (even if gloves are worn).
This medication can be given with or without food, though your veterinarian may recommend giving it with food due to its bitter taste. If your pet vomits or appears unwell after receiving a dose on an empty stomach, give future doses with food or a small treat. If vomiting continues, contact your veterinarian.
Missed doses
Administer the dose as soon as possible. If it is almost time for the next dose, skip the missed dose and continue with the regular schedule. Do not give more medication than prescribed or two doses at once.
If you have questions about your pet’s prescribed dosing schedule (e.g., timing, interval), please consult your veterinarian.
Storage
Store in a cool, dry place at a controlled room temperature (77°F, excursions permitted between 59 and 86°F), out of the reach of children and pets. Keep the container tightly closed in order to protect from moisture.
Exposure to extreme temperatures or moisture may affect the integrity and effectiveness of medications. Always store medications properly (e.g., away from the bathroom, kitchen sink, or other damp places).
Side effects
The most common side effects of this medication are decreased appetite, lethargy, vomiting, diarrhea/loose stools, skin lesions, and abnormal vocalization.
These effects may be more likely to occur at the start of treatment and usually diminish over time.
Contact your veterinarian immediately if your pet has complete loss of appetite, any unusual bruising or signs of bleeding, severe weakness, facial itching/sores, or if you notice yellowing of the skin, gums, or whites of the eyes.
This is not a complete list of all possible side effects. Notify your veterinarian if your pet experiences any of the effects described above, or if you notice any other side effects that are persistent or troublesome.
If you notice anything unusual, please consult your veterinarian.
Precautions
*For complete product information including warnings and precautions, please refer to the manufacturer package insert.
For oral use in cats only—not for use in humans.
Do NOT use in cats with primary liver disease, kidney failure, autoimmune disease, bleeding or clotting disorders (including anemia, neutropenia, lymphopenia, or thrombocytopenia).
Do NOT use in pregnant or lactating queens.
Use with caution in animals with kidney or liver dysfunction.
Safe use of this medication has not been established and should be used with caution in male cats intended for breeding.
Do not administer to animals with a known history or suspected allergy/hypersensitivity to carbimazole, polyethylene glycol, or this medication and any of its ingredients. Allergic reactions to medications may occur. Be sure to inform Vetsource and your veterinarian if your pet has any known drug sensitivities or allergies.
If your pet displays symptoms of an allergic reaction, discontinue therapy and call your veterinarian immediately or seek emergency veterinary attention. Symptoms may include (but are not limited to): swollen lips, tongue, face, or airways; difficulty breathing; agitation; profuse salivation; and widespread hives or itching.
Human exposure warning
This medication is classified as hazardous due to potential risks to individuals who are actively trying to conceive, as well as to women who are pregnant, breastfeeding, and those who may become pregnant.
Unopened, intact tablets may not pose the same degree of risk as injectable drugs, which usually require extensive preparation. Cutting, crushing, or otherwise manipulating tablets may increase the risk of exposure.
Women who are pregnant, nursing, and those who may become pregnant should wear protective gloves to prevent direct contact with tablets (especially if broken or moistened) and the litter, feces, urine, or vomit of a treated cat. All pet owners should wash their hands thoroughly with soap and water after handling the medication, or if contact is made with the litter or bodily fluids of a treated cat (even if gloves are worn).
Drug and food interactions
The following drugs* may have potential interactions with this medication:
anticoagulants (e.g., warfarin), beta blockers (e.g., atenolol, sotalol), benzimidazole antiparasitics (e.g., fenbendazole), digoxin, theophylline, and phenobarbital.
*NOTE: this may not be a comprehensive list. Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together.
Please ensure your veterinarian is aware of all medications and supplements that your pet is currently receiving. Your veterinarian may prescribe multiple medications, even if a potential drug interaction may occur. In these instances, your veterinarian may adjust the dosages or monitor your pet more closely.
Adverse reactions
If you are concerned that your pet has experienced an adverse reaction to this medication, please contact the manufacturer Dechra Veterinary Products at 866-933-2472 or Vetsource Pet Owner Care at 877-738-4443.
Overdose
If you have any reason to suspect an overdose, call your doctor/veterinarian or the appropriate poison control resource immediately.
For humans:
The national toll-free Poison Help line, 1-800-222-1222, will connect you to your local poison center in case of emergency. This service is available nationwide and in most U.S. territories.
For animals:
The ASPCA Animal Poison Control Center is available 24 hours a day, 365 days a year at 888-426-4435.
Pet Poison Helpline® also provides a 24/7 animal poison control service at 855-764-7661.
*Please note: this information is for third-party services and is provided for convenience in case of potential poison-related emergencies. There may be consultation fee for these services.
Disclaimer
The content provided on this page is NOT medical advice.
All content, including the images and product description above, is intended for general informational purposes only and should not be considered a substitute for professional veterinary consultation, diagnosis, or treatment.
Consult your veterinarian for complete information about this product and how it fits into your pet's individual treatment plan.
Last revised: 11/17/2025
-
Description
Product detailsFelimazole Coated Tablets (methimazole tablets) for Cats are indicated for the treatment of hyperthyroidism in cats. This product is a coated tablet formulation.- Felimazole Coated Tablets contain methimazole, an antithyroid drug that blocks the production of thyroid hormones.
- Easy dosing with two tablet strengths.
- Small sugar-coated tablets for ease of administration.
- Affordable treatment option for cats with hyperthyroidism.
- Do not administer to pregnant or lactating animals; wear gloves or avoid handling if you are pregnant, nursing, or planning to become pregnant.
Felimazole treats feline hyperthyroidism, a commonly diagnosed disease in senior cats. The disease results in excess levels of thyroid hormone being produced in the thyroid gland. Symptoms can include weight loss, increased thirst and urination, vomiting, and excess activity.This product contains a chemical on the Prop 65 List.*Please note: The images provided are for illustrative purposes. Your product may be delivered in a Vetsource Pharmacy vial; product packaging & appearance may vary and are subject to manufacturer availability.Product sourced directly from the manufacturer or their approved distributor. Guaranteed genuine product backed by the manufacturer.ForCatsActive ingredient(s)MethimazoleInactive ingredientsComplete inactive ingredients list not provided by manufacturer.Brand nameFelimazole Coated TabletsDrug classAntithyroid agentManufacturerDechra Veterinary ProductsProduct strength & sizeFelimazole Coated Tablets may be available in multiple strengths and/or sizes. Please ensure the selected product and package size are appropriate for your pet, as recommended by your veterinarian.For current availability, please refer to the product selection above.Usage*For complete product information, please review the full prescribing information in the manufacturer package insert.Felimazole Coated Tablets should be given orally as directed by your veterinarian. Please consult your veterinarian before making any changes or discontinuing the prescribed dosing schedule. Your veterinarian will monitor your pet’s bloodwork while taking this medication.Do not break or crush tablets. Wear protective gloves to prevent direct contact with litter, feces, urine, or vomit of treated cats, and broken or moistened tablets. All pet owners should wash their hands thoroughly with soap and water after handling the medication or if contact is made with the litter or bodily fluids of a treated cat (even if gloves are worn).This medication can be given with or without food, though your veterinarian may recommend giving it with food due to its bitter taste. If your pet vomits or appears unwell after receiving a dose on an empty stomach, give future doses with food or a small treat. If vomiting continues, contact your veterinarian.Missed dosesAdminister the dose as soon as possible. If it is almost time for the next dose, skip the missed dose and continue with the regular schedule. Do not give more medication than prescribed or two doses at once.If you have questions about your pet’s prescribed dosing schedule (e.g., timing, interval), please consult your veterinarian.StorageStore in a cool, dry place at a controlled room temperature (77°F, excursions permitted between 59 and 86°F), out of the reach of children and pets. Keep the container tightly closed in order to protect from moisture.Exposure to extreme temperatures or moisture may affect the integrity and effectiveness of medications. Always store medications properly (e.g., away from the bathroom, kitchen sink, or other damp places).Side effectsThe most common side effects of this medication are decreased appetite, lethargy, vomiting, diarrhea/loose stools, skin lesions, and abnormal vocalization.These effects may be more likely to occur at the start of treatment and usually diminish over time.Contact your veterinarian immediately if your pet has complete loss of appetite, any unusual bruising or signs of bleeding, severe weakness, facial itching/sores, or if you notice yellowing of the skin, gums, or whites of the eyes.This is not a complete list of all possible side effects. Notify your veterinarian if your pet experiences any of the effects described above, or if you notice any other side effects that are persistent or troublesome.If you notice anything unusual, please consult your veterinarian.Precautions*For complete product information including warnings and precautions, please refer to the manufacturer package insert.For oral use in cats only—not for use in humans.Do NOT use in cats with primary liver disease, kidney failure, autoimmune disease, bleeding or clotting disorders (including anemia, neutropenia, lymphopenia, or thrombocytopenia).Do NOT use in pregnant or lactating queens.Use with caution in animals with kidney or liver dysfunction.Safe use of this medication has not been established and should be used with caution in male cats intended for breeding.Do not administer to animals with a known history or suspected allergy/hypersensitivity to carbimazole, polyethylene glycol, or this medication and any of its ingredients. Allergic reactions to medications may occur. Be sure to inform Vetsource and your veterinarian if your pet has any known drug sensitivities or allergies.If your pet displays symptoms of an allergic reaction, discontinue therapy and call your veterinarian immediately or seek emergency veterinary attention. Symptoms may include (but are not limited to): swollen lips, tongue, face, or airways; difficulty breathing; agitation; profuse salivation; and widespread hives or itching.Human exposure warningThis medication is classified as hazardous due to potential risks to individuals who are actively trying to conceive, as well as to women who are pregnant, breastfeeding, and those who may become pregnant.Unopened, intact tablets may not pose the same degree of risk as injectable drugs, which usually require extensive preparation. Cutting, crushing, or otherwise manipulating tablets may increase the risk of exposure.Women who are pregnant, nursing, and those who may become pregnant should wear protective gloves to prevent direct contact with tablets (especially if broken or moistened) and the litter, feces, urine, or vomit of a treated cat. All pet owners should wash their hands thoroughly with soap and water after handling the medication, or if contact is made with the litter or bodily fluids of a treated cat (even if gloves are worn).Drug and food interactionsThe following drugs* may have potential interactions with this medication: anticoagulants (e.g., warfarin), beta blockers (e.g., atenolol, sotalol), benzimidazole antiparasitics (e.g., fenbendazole), digoxin, theophylline, and phenobarbital.*NOTE: this may not be a comprehensive list. Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together.Please ensure your veterinarian is aware of all medications and supplements that your pet is currently receiving. Your veterinarian may prescribe multiple medications, even if a potential drug interaction may occur. In these instances, your veterinarian may adjust the dosages or monitor your pet more closely.Adverse reactionsIf you are concerned that your pet has experienced an adverse reaction to this medication, please contact the manufacturer Dechra Veterinary Products at 866-933-2472 or Vetsource Pet Owner Care at 877-738-4443.OverdoseIf you have any reason to suspect an overdose, call your doctor/veterinarian or the appropriate poison control resource immediately.For humans:The national toll-free Poison Help line, 1-800-222-1222, will connect you to your local poison center in case of emergency. This service is available nationwide and in most U.S. territories.For animals:The ASPCA Animal Poison Control Center is available 24 hours a day, 365 days a year at 888-426-4435.Pet Poison Helpline® also provides a 24/7 animal poison control service at 855-764-7661.*Please note: this information is for third-party services and is provided for convenience in case of potential poison-related emergencies. There may be consultation fee for these services.DisclaimerThe content provided on this page is NOT medical advice.All content, including the images and product description above, is intended for general informational purposes only and should not be considered a substitute for professional veterinary consultation, diagnosis, or treatment.Consult your veterinarian for complete information about this product and how it fits into your pet's individual treatment plan.Last revised: 11/17/2025 -
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