A 60-year-old female patient treated with an SSRI for depression shows no improvement, gains weight, and feels lethargic. What should be assessed next?

• A. An increased dosage of medication
• B. Thyroid function tests
• C. A change to a different medication
• D. Renal function tests

Answer: (B)

In this scenario, the patient is experiencing symptoms such as weight gain and lethargy while being treated with an SSRI for depression, without showing improvement. These symptoms may suggest that there could be an underlying medical issue contributing to her depressive symptoms or that the pharmaceutical treatment is not optimal.

Assessing thyroid function is particularly important in this case because hypothyroidism can manifest with symptoms like lethargy and weight gain. It can also complicate the treatment of depression, as low thyroid hormone levels can negatively influence mood and response to antidepressants. Therefore, evaluating thyroid function could identify whether a thyroid disorder is affecting her mental health and physical well-being.

This step aligns with best practices in psychiatric care, where it's essential to consider medical comorbidities that could impact the patient's mental health. Identifying any physiological causes is critical in tailoring the treatment plan to ensure the best outcome for the patient.