<human>: I've heard there's a new drug called Prozac. Is it safe to take?
<bot>: Prozac is an antidepressant that was developed in the late 1960s and early 1970s. It works by increasing the amount of serotonin, a neurotransmitter, in the brain. Serotonin is involved in regulating mood and behavior, and low levels of serotonin have been linked to depression.