Zoloft (sertraline) is used for the treatment of depression, anxiety, and 125 mcg levothyroxine obsessive-compulsive disorder. Launched in 1992, 125 mcg levothyroxine it has been used in over 10 billion patient days of therapy. Zoloft is a SSRI drug that increases the level of serotonin in the brain by inhibiting its breakdown. So why take Zoloft? Because it's an SSRI drug and easier on your liver...