A blue-colored alcoholic beverage, Romulan Ale was illegal in the United Federation of Planets as early as 2285, although that prohibition was (at least briefly) lifted in 2374, following an alliance between the Federation and the Romulan Star Empire. It had a powerful intoxicating effect, and Dr. McCoy kept a small supply that he had smuggled across the border, which he claimed only to use "for medicinal purposes" in 2285. In 2293, Lieutenant Valeris suggested that the "small supply of Romulan Ale aboard" the Enterprise be served at a formal dinner with Klingon Chancellor Gorkon, which Captain Kirk described as "officer thinking," though he later noted that "Romulan Ale [is] no longer to be served at diplomatic functions."
- Star Trek II: The Wrath of Khan. Film. Paramount Pictures Corporation, 4 June 1982.
- "Inter Arma Enim Silent Leges". Star Trek: Deep Space Nine, Episode 565. Television. Paramount Pictures Corporation, 1999.
- Star Trek: Nemesis. Film. Paramount Pictures Corporation, 13 December 2002.
- Star Trek VI: The Undiscovered Country. Film. Paramount Pictures Corporation, 6 December 1991.