Fluoxetine.

http://en.wikipedia.org/wiki/Fluoxetine

Fluoxetine (also known by the trade names Prozac, Sarafem, Ladose and Fontex, among others) is anantidepressant of the selective serotonin reuptake inhibitor (SSRI) class. Fluoxetine was first documented in 1974 by scientists from Eli Lilly and Company.It was approved by the U.S. Food and Drug Administration for the treatment of major depressive disorder in December 1987.The U.S. fluoxetine patent expired in August 2001 and hence generic formulations are now available in the U.S..

Fluoxetine is used for the treatment of major depressive disorder (including pediatric depression), obsessive-compulsive disorder (in both adults and children), bulimia nervosa, panic disorder and premenstrual dysphoric disorder.In addition, fluoxetine is used to treat trichotillomania if cognitive behaviour therapy has been unsuccessful.

In 2010, over 24.4 million prescriptions for generic formulations of fluoxetine were filled in the United States,making it the third most prescribed antidepressant after sertraline and citalopram.In 2011, 6 million prescriptions for fluoxetine were filled in the United Kingdom.

It is on the World Health Organization's List of Essential Medicines, a list of the most important medication needed in a basic health system.