M.P.
Hello!
I worked in veterinary medicine for 9 years & saw MANY cats with this condition. In my experience, the medication worked well & the cats went on to live normal lives. The medication is also available in a transdermal ear gel that is good for those kitties that don't like pills. Another alternative is surgery to remove the thyroid or there is also radiation treatments as well.The best thing is to sit down with your veterinarian & go over all your options to decide what is best for your kitty's health & your pocket book. Good luck!! :)