The subject who was diagnosed with hyperthyroidism was given propylthiouracil (prevents T 4 production and conversion of T 4 to T 3 in the tissues). After 2 months of treatment, her TSH levels...

The subject who was diagnosed with hyperthyroidism was given propylthiouracil (prevents T₄ production and conversion of T₄ to T₃ in the tissues). After 2 months of treatment, her TSH levels increased by 371.15 % and her T₄ levels decreased by 42.7 %. Explain why her TSH levels increased and her T₄ levels decreased.