Final answer:
Selective serotonin reuptake inhibitors (SSRIs) can cause CNS stimulation as a side effect, leading to symptoms such as agitation, insomnia, anxiety, and difficulty concentrating.
Step-by-step explanation:
Selective serotonin reuptake inhibitors (SSRIs) are commonly used to treat depression. While SSRIs can be effective in alleviating depressive symptoms, they can also have side effects related to central nervous system (CNS) stimulation. These side effects may include agitation, insomnia, anxiety, and difficulty concentrating. It is important to note that the severity and occurrence of these side effects can vary from person to person.