Zoloft is an antidepressant that is used to treat depression, Furosemide dosage for adults anxiety and Furosemide dosage for adults obsessive compulsive disorder. It is a selective serotonin reuptake inhibitor (SSRI) which help to increase the amount of serotonin available in the brain. Zoloft produces fewer side effects than older antidepressants called tricyclics, such as Elavil and Tofranil.