In this task, you will be given sentences in which your task is to recognize the name of the drug or medicine. Drugs are substances that change a person's mental or physical state. They can affect how your brain works, how you feel and behave, your understanding, and your senses. Although there might be several correct answers, you need to write one of them.

[Q]: Regression of thyrotoxic ophthalmopathy following lithium withdrawal.
[A]: lithium


[Q]: Discontinuation of the itraconazole caused resolution of the drug eruption.
[A]: itraconazole


[Q]: CONCLUSION: Healthcare professionals should be aware of the possible development of serotonin syndrome as a complication of initiation of fentanyl and other phenylpiperidine opioids in patients treated with SSRIs.
[A]:
fentanyl