Mood drug

Mood drugs were chemical-releasing cellophane patches used by the people of New Earth from some time before 5,000,000,023 until 5,000,000,053, typically in the New New York Undercity, including Pharmacytown. They generally produced emotions, such as Happy, although others affected the mind in other ways, such as Sleep, Honesty, Anger and Forget. In the Undercity, they were mainly sold by the pharmacists. They were usually harmless.

One mood drug, however, Bliss, was only found in the upper levels of New New York. It was extremely addictive. An airborne virus mutated in it. This spread and killed the entire population of the upper levels within seven minutes, except the Face of Boe in his life-support tank and Novice Hame, whom Boe surrounded with his smoke. The inhabitants of the Undercity and those in the Motorway survived. With no one to feed on, the virus eventually starved to death and became extinct. (TV: Gridlock)

A conversation between a Pharmacist and a pale woman suggests some if not all of the mood patches came in different degrees of strengths or duration up to at least forty-three.

Types

 * Happy - When the patch was placed on a person it would put them in a happy mood.
 * Sleep - Placed on a subject, it would put them to sleep for an indeterminate amount of time.
 * Forget - Forget made people forget certain periods of time. One of the last patches bought at Pharmacytown was bought by a pale woman so that she could forget the disappearance of her parents on the motorway.
 * Honesty - When placed on a person, it would not let that person lie, only say the truth until the patch is removed.
 * Bliss - An addictive drug which caused a blissful mood; eventually it mutated into a fatal virus.
 * Witty
 * Mellow
 * Anger
 * Rage
 * Fury

The Doctor's supplies
The Twelfth Doctor was shown to keep mood patches aboard the TARDIS. Clara stole a sleep patch from his supply and incapacitated the Doctor in an attempt to save her boyfriend, Danny Pink. (TV: Dark Water)