Review Question - QID 109100

A 21-year-old female comes to the physician’s office because of insomnia. For the past 9 months, the patient has been having a hard time falling asleep because she “can’t turn her mind off.” She is a student in a nearby university and spends hours at the end of each day worrying about her classes as well as her upcoming tests. When she doesn’t have tests, she worries about her family and her boyfriend even though admits she has no specific concerns about them. This constant worrying has led to insomnia and an inability to focus in class. She has also been fatigued and hasn’t had the energy to go the gym as she usually does. The most effective medication for her disorder has what mechanism of action?