Caffeine

Caffeine was a drug that was legal on Earth in 1799, (PROSE: Christmas on a Rational Planet ^[+]Loading...["Christmas on a Rational Planet (novel)"]) which kept humans awake. It was found in most types of coffee, (AUDIO: Technophobia ^[+]Loading...["Technophobia (audio story)"]) as well as caffeine rings. (AUDIO: Night Watch ^[+]Loading...["Night Watch (audio story)"])

Double-caffeinated cappuccinos topped with nutmeg were a favoured drink of the Fifth Doctor. (PROSE: Not So Much a Programme, More a Way of Life ^[+]Loading...["Not So Much a Programme, More a Way of Life (short story)"])

Donna Noble didn't give the Tenth Doctor coffee because he was "the last person [she would] give caffeine". (AUDIO: Technophobia ^[+]Loading...["Technophobia (audio story)"])

The planet Chloris' climate was ideal for growing super-caffeinated coffee beans. (PROSE: Lights Out ^[+]Loading...["Lights Out (short story)"])

Yvonne Hartman sometimes used a caffeine ring to keep herself awake instead of having an espresso. This proved useful when the Night Sun came to Cardiff and put the city to sleep. (AUDIO: Night Watch ^[+]Loading...["Night Watch (audio story)"])

The planet Ursu had no caffeine. (AUDIO: Beyond the Sun ^[+]Loading...["Beyond the Sun (audio story)"])

Caffy was a caffeinated beverage similar to coffee. It was drunk by some of the residents of the city of Hope. (PROSE: Hope ^[+]Loading...["Hope (novel)"])