Product details
Felanorm (methimazole) Oral Solution for Cats is indicated for the treatment of hyperthyroidism in cats.
- Felanorm is the first FDA-approved oral solution for feline hyperthyroidism.
- Proven track record (over 100 million sold doses in the U.K.)1.
- Syringe marked in 0.25 mg increments for accurate dose titration.
- Easy-To-Give (International Society of Feline Medicine awarded)2.
- Felanorm® Oral Solution should not be given to cats that are pregnant, nursing, or that have been diagnosed with kidney, liver, or blood disorders.
Felanorm is a prescription oral solution containing methimazole and is used for the treatment of hyperthyroidism in cats.
Hyperthyroidism occurs when the thyroid gland over-produces thyroid hormone and is a lifelong condition that requires treatment. Felanorm reduces the production of thyroid hormone. Common signs of hyperthyroidism include weight loss, and an increase in appetite, thirst, and urination. Other signs may include vomiting, diarrhea, hyperactivity, and unkempt coat.
References:
1. Kynetec Sales Data, U.K. (based on standard 2.5 mg dose).
2. International Society of Feline Medicine Easy-To-Give award 2017 (NOTE: Thyronorm® is the U.K. brand name for Felanorm; both share the exact same formulation).
This product contains a chemical on the Prop 65 List.
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
Felanorm Oral Solution
Drug class
Antithyroid agent
Product flavoring
Felanorm Oral Solution is honey flavored.
Manufacturer
Norbrook
Product strength & size
Felanorm Oral Solution contains 5 mg of methimazole per 1 mL of solution and is available in 30 mL or 100 mL bottles. 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
*Please review the full prescribing information/manufacturer’s package insert for detailed administration instructions, including recommended Instructions for Use.
Felanorm Oral Solution should be given orally as directed by your veterinarian. Wash your hands thoroughly with soap and water after handling the medication. 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.
Always wear protective gloves when administering Felanorm or to prevent direct contact with litter, feces, urine, or vomit of treated cats. 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 product should be administered orally using the enclosed graduated dosing syringe. The syringe has measurements representing the mg dose of the product.
To avoid contamination of the product bottle, the dosing syringe should be rinsed externally, cleaned, and dried between doses and between individual fillings (when multiple fillings of the dosing syringe are needed to provide a single dose).
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, with excursions permitted between 59 and 86°F). Keep in a secure location out of the reach of children and pets. Felanorm should be stored in its original container and kept tightly closed when not in use.
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 commonly reported side effects of this medication are anorexia, vomiting, head/facial pruritus or edema, depression/lethargy, weight loss, anemia, elevated liver enzymes, skin lesions, elevated BUN, diarrhea, and thrombocytopenia.
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
*Please refer to the manufacturer package insert for full product information, including warnings and safety precautions.
For use in cats only—not for use in humans.
Do NOT use in cats with primary liver disease, kidney failure, autoimmune disease, or any bleeding or clotting disorder (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.
All pet owners—especially pregnant women, women who may become pregnant, and nursing mothers—should wear protective single use, impermeable (e.g., latex or nitrile) gloves when administering the solution. Wash hands with soap and water after administration to avoid drug exposure.
Protective gloves should also be worn to prevent direct contact with the solution and/or the litter, feces, urine, or vomit of a treated cat. Wash 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), benzimidazole antiparasitics (e.g., fenbendazole), beta blockers (e.g., atenolol, sotalol), digoxin, phenobarbital, and theophylline.
*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 Norbrook at 1-866-591-5777 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: 12/18/2025
-
Description
Product detailsFelanorm (methimazole) Oral Solution for Cats is indicated for the treatment of hyperthyroidism in cats.- Felanorm is the first FDA-approved oral solution for feline hyperthyroidism.
- Proven track record (over 100 million sold doses in the U.K.)1.
- Syringe marked in 0.25 mg increments for accurate dose titration.
- Easy-To-Give (International Society of Feline Medicine awarded)2.
- Felanorm® Oral Solution should not be given to cats that are pregnant, nursing, or that have been diagnosed with kidney, liver, or blood disorders.
Felanorm is a prescription oral solution containing methimazole and is used for the treatment of hyperthyroidism in cats.Hyperthyroidism occurs when the thyroid gland over-produces thyroid hormone and is a lifelong condition that requires treatment. Felanorm reduces the production of thyroid hormone. Common signs of hyperthyroidism include weight loss, and an increase in appetite, thirst, and urination. Other signs may include vomiting, diarrhea, hyperactivity, and unkempt coat.References:1. Kynetec Sales Data, U.K. (based on standard 2.5 mg dose).2. International Society of Feline Medicine Easy-To-Give award 2017 (NOTE: Thyronorm® is the U.K. brand name for Felanorm; both share the exact same formulation).This product contains a chemical on the Prop 65 List.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 nameFelanorm Oral SolutionDrug classAntithyroid agentProduct flavoringFelanorm Oral Solution is honey flavored.ManufacturerNorbrookProduct strength & sizeFelanorm Oral Solution contains 5 mg of methimazole per 1 mL of solution and is available in 30 mL or 100 mL bottles. 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*Please review the full prescribing information/manufacturer’s package insert for detailed administration instructions, including recommended Instructions for Use.Felanorm Oral Solution should be given orally as directed by your veterinarian. Wash your hands thoroughly with soap and water after handling the medication. 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.Always wear protective gloves when administering Felanorm or to prevent direct contact with litter, feces, urine, or vomit of treated cats. 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 product should be administered orally using the enclosed graduated dosing syringe. The syringe has measurements representing the mg dose of the product.To avoid contamination of the product bottle, the dosing syringe should be rinsed externally, cleaned, and dried between doses and between individual fillings (when multiple fillings of the dosing syringe are needed to provide a single dose).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, with excursions permitted between 59 and 86°F). Keep in a secure location out of the reach of children and pets. Felanorm should be stored in its original container and kept tightly closed when not in use.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 commonly reported side effects of this medication are anorexia, vomiting, head/facial pruritus or edema, depression/lethargy, weight loss, anemia, elevated liver enzymes, skin lesions, elevated BUN, diarrhea, and thrombocytopenia.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*Please refer to the manufacturer package insert for full product information, including warnings and safety precautions.For use in cats only—not for use in humans.Do NOT use in cats with primary liver disease, kidney failure, autoimmune disease, or any bleeding or clotting disorder (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.All pet owners—especially pregnant women, women who may become pregnant, and nursing mothers—should wear protective single use, impermeable (e.g., latex or nitrile) gloves when administering the solution. Wash hands with soap and water after administration to avoid drug exposure.Protective gloves should also be worn to prevent direct contact with the solution and/or the litter, feces, urine, or vomit of a treated cat. Wash 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), benzimidazole antiparasitics (e.g., fenbendazole), beta blockers (e.g., atenolol, sotalol), digoxin, phenobarbital, and theophylline.*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 Norbrook at 1-866-591-5777 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: 12/18/2025 -
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