Methimazole (Tapazole)

Only Available By Prescription

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What is Generic?

What is a Generic Drug?

A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.

The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.

Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.


Tapazole (Common Drug Name:Methimazole) is generally used in Cats to treat hyperthyroidism, a condition where the thyroid gland produces too much thyroid hormone. Tapazole assists in reducing the amount of thyroid hormone produced by the body. Tapazole(Methimazole) may be used in dogs receiving cisplatin, an anti-cancer drug, in order to protect the kidneys.


Follow the dosage instructions outlined by your veterinarian. Do not use in pregnant or nursing animals. Tapazole can be given with or without food. Blood testing should be conducted periodically to monitor liver function and for any toxic effects on blood cells.


Tapazole Ingredients: Methimazole

Generic to Tapazole: Methimazole


Contact your veterinarian immediately if your pet has a fever (temperature over 103°F), shows signs of bruising or bleeding, exhibits symptoms of an allergic reaction to the medication (signs may include facial swelling, hives, scratching, sudden onset of diarrhea, vomiting, shock, seizures, pale or yellow gums, cold limbs, or coma.) Liver failure has also been reported in rare cases.

Side Effects

SIDE EFFECTS that may occur while taking this medication includes skin rash, itching, abnormal hair loss, upset stomach, vomiting, loss of taste, abnormal sensations, swelling, joint and muscle pain, drowsiness, dizziness, decreased white blood cells and decreased platelets.