Poison

Poisons were substances that could cause disturbances to organisms.

On the Sense Sphere, a group of humans added the poisonous chemical atropine to the water supply. (DW: The Sensorites)

DN6 was a pesticide, developed to end world famine. It was so efficient that extensive use would have damaged the world's ecology. (DW: Planet of Giants)

The Macra fed upon a poisonous gas and had humans mine it for them. (DW: The Macra Terror) In the far future, a devolved variant of the species fed on the poisonous gases that congregated underneath the Motorway. (DW: Gridlock)

A number of Cybermats infected the crew of Nerva Beacon with a poison through their bite. Warner was killed in this way and Sarah Jane Smith was only cured after travelling through a transmat. (DW: Revenge of the Cybermen)


 * In the real world, such an infection would likely be termed venom, but Revenge of the Cybermen explicitly uses the word poison.

Dianene was a poison that took effect once it was inhaled. Megropolis One was fitted with a sprinkler system that could release dianene in the event of a crisis. (DW: The Sun Makers)

The poison cyanide was used for a variety of purposes, such as killing individuals, (DW: The Brain of Morbius) killing moths for a personal collection, (DW: The Two Doctors) or creating antidotes. (TW: Rendition) Birastrop were immune to the effects of cyanide. (DW: The Brain of Morbius)

Members of the Tong of the Black Scorpion were expected to consume deadly capsules of scorpion venom if they failed in their duty. (DW: The Talons of Weng-Chiang)

The Fifth Doctor advocated the use of hexachromite gas against the Silurian and Sea Devils who had invaded Sea Base 4. The poison was only deadly to marine life. (DW: Warriors of the Deep)

Coming into contact with raw spectrox would cause spectrox toxaemia and lead to death. The Fifth Doctor and Peri Brown both became infected while on Androzani Minor. The Doctor managed to save Peri with the milk from a Queen Bat but was forced to regenerate to save his own life. (DW: The Caves of Androzani)

Female Raxacoricofallapatorians could release poison when in danger, either through their breath or with a dart, released from their finger. (DW: Boom Town)

While on an aeroplane, Lyn Peterfield poisoned Jack Harkness with arsenic. He managed to get it out of his system by following the advice of Dr. Vera Juarez. (TW: Rendition)