Methimazole | Petco

Related Articles & Questions

Health & Wellbeing
Amlodipine for Pets: Protect Your Dog & Cat from High Blood Pressure
Search Petco for information on amlodipine medication. We will give you details to make sure your pets are kept happy and healthy.
Updated on October 23rd, 2025
Health & Wellbeing
Methionine for Dogs & Cats: Stop Urinary Crystals & Stones
Methionine is a urinary acidifier used to prevent and treat urinary stones in dogs and cats. Vet Rx Required.  
Updated on October 23rd, 2025
Health & Wellbeing
Clavamox for Dogs & Cats: Treat Infections & Keep Pets Healthy
Do you think your pet has a bacterial infection? Visit Petco to learn how Clavamox can help your dog and cat.
Updated on October 23rd, 2025
Health & Wellbeing
Pimobendan for Dogs & Cats: Heart Meds, Dosage, Uses & Side Effects
Want to know if it is safe to give your dog or cat Pimobendan? Petco has the answers to this and other pet medication questions!
Updated on October 23rd, 2025
Health & Wellbeing
Enalapril for Pets: Treat Heart, Kidney & Blood Pressure Effectively
Do you think your dog or cat has heart issues and high blood pressure? Visit Petco to learn how enalapril can help your pet.
Updated on October 23rd, 2025
Health & Wellbeing
highly concerning side effects suddenly began 11/22/18, after 2 weeks of methimazole (pill) for hyperthyroidism - lethargy, vomiting, face itching, irritability, hiding all day, less frequent bowel movements, bouts of anxiety. He has NOT refused food
These signs could be consistent with methimazole related side effects. GI upset and facial itching are some of the most common acute side effects in the first few months of therapy. I would recommend stopping the medication until you can talk to your vet about your concerns. Some cats can not take this medication and thus require an alternate method of treatment. If still eating and drinking that is good. If any of the symptoms worsen an ER visit is advised. I hope this helps and thank you for using Boop by Petco!
Updated on September 24th, 2025
Health & Wellbeing
I put my cat's methimazole in a pat of butter so he will take the meds. Can I put together more than one dose this way?
I think I know what you're asking - you're asking if you can put together multiple doses of methimazole in separate aliquots of butter, correct? According to Plumb's veterinary handbook, methimazole is supposed to be stored in a closed container, away from light and at room temperature. So I think it would probably not be a good idea to prepare your butter + methimazole "doses" ahead of time, since the butter would need to stay in the refrigerator to stay solid. If it's hard to medicate your cat, you might investigate having your vet order a compounded flavored oral suspension of methimazole. This is usually quite easy to give, and compounding pharmacies can make meds with virtually any flavor added, so pets will take them.
Updated on September 24th, 2025
Health & Wellbeing
My cat is hyperthyroid and on methimazole twice a day. I am going away for a week and wanted to know if i can double up her medicine to once a day so my pet sitter would only need to make one visit a day
Hi, thanks fir using Boop by Petco! Madeline is super cute! Yes, that is absolutely fine to have the pet sitter give methimazole once daily (double the single dose to equal her twice a day dose) while you are away! Have a great weekend!
Updated on September 24th, 2025
Health & Wellbeing
My 17 yr old cat has been diagnosed with hyperthyroidism. she was started on Methimazole chew treats and now refuses to eat them. I switched to the twist a dose ear Methimazole but if I give that to her daily like the vet suggested, all she does is
Luv Bug is so very fortunate to have you as an owner. I am sure that you are one of the main reasons that she is going strong at 17 years of age. Kudos to you for your consideration and compassion for your pet. In terms of hyperthyroidism in cats, there are only three real treatments on the market today. These are methimazole treatment, thyroidectomy surgery, and radioactive iodine treatment. It is believed in the veterinary community that radioactive iodine is the gold standard treatment today. With the information you have provided, I can offer you a few possibilities for future treatment: 1. Perhaps you can get the math him is all in a tablet form to crush it into a fine powder and then mix it with any palatable substance that she likes and then squirt it in her mouth with a syringe. This, however, may cause some behavior problems because she may not like this either. 2. If you are willing to accept the costs and all of the different parts that go with the radioactive iodine t
Updated on September 24th, 2025
Health & Wellbeing
Since getting my 16y.o. cat on the right dosage of methimazole he has COMPLETELY CHANGED, seems wiped out, doesn't rcome when I call, walks around like he's in a cloud, and stops mid-move like HE'S FORGOTTEN HIS INTENTION! Not sure if this is med-rel
Richochet is one handsome little guy! I'm sorry to hear that he's had so many behavioral changes since his methimazole dose has been regulated. The most common side effects from methimzaole include stomach upset (vomiting, diarrhea, appetite changes), lethargy, facial itchiness, as well as some liver issues and changes in blood cell counts. Behavioral changes aren't documented as known side effects of this medication (I just double checked!), although excess vocalization has been recognized as a side effect. While we keep in mind that not all cats "read the textbooks," it would be unexpected for all of these behavioral changes to occur due to methimazole alone. Given your recent move and Richochet's age, it does stand to reason that anxiety from these changes or cognitive dysfunction (essentially kitty dementia) could be to blame here. I don't think it's necessarily wrong to give Prozac a try, but it's also important to note that it takes about 2 months for that medication to reach th
Updated on September 24th, 2025