Final answer:
The adverse reactions to propylthiouracil (PTU) that the patient is experiencing - weight gain, drowsiness, and depression - are indicative of hypothyroidism.
Step-by-step explanation:
The adverse reactions to propylthiouracil (PTU) that the patient is experiencing - weight gain, drowsiness, and depression - are indicative of hypothyroidism.
Hypothyroidism is a condition in which the thyroid gland is underactive and does not produce enough thyroid hormones, resulting in a decrease in metabolism. This can lead to weight gain, fatigue, and depression.
Therefore, the health care professional should suspect that the patient is experiencing hypothyroidism as an adverse reaction to propylthiouracil.