Potion

From Tardis Wiki, the free Doctor Who reference
Potion
Lilith using the green smoke of a potion to bewitch William Shakespeare. (TV: The Shakespeare Code)

The Carrionites concocted potions. (TV: The Shakespeare Code) The Disciples of Saxon created a potion in order to restore the Saxon Master to life. In turn, Lucy Saxon's family created a counter potion in a failed attempt kill the Master. (TV: The End of Time)