Radioiodine therapy offers a permanent, single-treatment cure for feline hyperthyroidism with minimal welfare impact and excellent long-term outcomes.
Radioiodine therapy represents the optimal welfare option for most cats with hyperthyroidism: a single treatment provides permanent cure without surgery risks, without the compliance challenges of twice-daily medication, and without the side effects of methimazole. The mandatory isolation period after treatment is the primary welfare concern - cats must be hospitalized in specialist facilities for radiation safety purposes, which causes stress from the unfamiliar environment and separation from owners. However, this single period of welfare compromise is outweighed by the lifetime benefit of permanent cure compared to the ongoing welfare costs of daily medication or chronic uncontrolled hyperthyroidism. Careful kidney function monitoring post-treatment is essential as unmasked CKD requires management.