Thank you for contacting Drs. Foster & Smith with your question.
We would recommend feeding your cat one of the brands of food that your veterinarian recommended. In terms of what particular formula you feed would depend upon several factors such as your cat’s age, weight, activity level, and medical conditions, to name a few. Your veterinarian most likely would recommend an adult maintenance diet for your cat. Since your cat is hyperthyroid, he/she is likely an adult cat and probably is not overweight, so kitten food and light diets probably would not be the most appropriate for your cat. If your cat has any other medical conditions, such as kidney disease or food sensitivities, your veterinarian may recommend a prescription diet. There is a also prescription diet available for the management of hyperthyroidism in cats. Prescription diets are only available through your veterinarian.
We would recommend discussing your options with your veterinarian before choosing a diet to be sure that your veterinarian agrees that the food is the most appropriate for your cat’s age, weight, and medical condition(s).
We hope this information is helpful. Thanks again for contacting us.
Drs. Foster & Smith