Prozac was a drug created by Humans from the planet Earth's 20th century.
History and specifics[]
In the year 1989, Roberta Lincoln described the peaceful end of the 1980s to be as if the entire world had taken a Prozac. (TOS - The Eugenics Wars novel: The Rise and Fall of Khan Noonien Singh, Volume 1)
In 1999 after a dinner on Earth, a time traveling Spock and Q shook hands, but the contact inadvertently swapped their personalities, leaving Q to ask Spock whether he was on Prozac. (ST audiobook: Spock vs. Q: The Sequel)