Zoloft (sertraline) hydrochloride is an antidepressant used to treat depression, panic disorder and obsessive-compulsive disorder (OCD). It belongs to the class cost of propecia in australia drugs called selective serotonin reuptake inhibitors (SSRIs), which block the reabsorption of serotonin by certain nerve cells in the brain. As a result, this helps boost the levels of serotonin available in the brain.