Zoloft (sertraline) hydrochloride is an antidepressant used to treat depression, panic disorder and Metronidazole dosage for bv obsessive-compulsive disorder (OCD). It belongs to the class of drugs called selective serotonin reuptake inhibitors (SSRIs), Metronidazole dosage for bv 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.