Poison Poisons were materials that , when ingested , could cause harm or kill an organism . On the Sense Sphere , a group of human s added the poisonous chemical atropine to the water supply . ( TV : " The Sensorites " ) DN6 was a pesticide , developed to end world famine . It was so effective that extensive use would have damaged the world ' s ecology . ( TV : " Planet of Giants " ) Poppaea , jealous of Barbara , ordered court poisoner Locusta to poison Barbara ' s drink . Vicki switched cups so that Nero ' s was poisoned , and informed the First Doctor of her actions . When the Doctor told Nero that his drink was poisoned , Nero gave it to his slave Tigilinus , who drank it and died . ( TV : " Conspiracy " ) The Macra fed upon a poisonous gas and had humans mine it for them . ( TV : " The Macra Terror " ) In the far future , a devolved variant of the species fed on the poisonous gases that accumulated underneath the Motorway . ( TV : " Gridlock " ) Cybermat s 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 . ( TV : " Revenge of the Cybermen " ) 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 as a part of " Contingency Plan A " . ( TV : " The Sun Makers " ) The poison cyanide was used for a variety of purposes , such as killing individuals , ( TV : " The Brain of Morbius " ) killing moth s for a personal collection , ( TV : " The Two Doctors " ) or creating antidote s . ( TV : " Rendition " ) Birastrop were immune to the effects of cyanide . ( TV : " 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 . ( TV : " The Talons of Weng - Chiang " ) The Fifth Doctor advocated the use of hexachromite gas against the Silurian s and Sea Devil s who had invaded Sea Base 4 . The poison was deadly to marine and reptile life . ( TV : " 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 . ( TV : " The Caves of Androzani " ) Lady Peinforte had Dorothea Remington poisoned in 1621 for bribing away her cook . She would later recall how it had been a " slow poisoning " . ( TV : " Silver Nemesis " ) The Judas tree contained a deadly poison which could stop a Time Lord from being able to regenerate . Trained by the Silence , Melody Pond kissed the Eleventh Doctor with lipstick made from the poison of the Judas Tree . He was only saved when she sacrificed her remaining regenerations to revive him . ( TV : " Let ' s Kill Hitler " ) Female Raxacoricofallapatorian s could release poison with a dart released from their finger . As a " final resort " , the excess poisons were exhaled through the lung s . ( TV : " Boom Town " ) While on an aeroplane , Lyn Peterfield poisoned Jack Harkness with arsenic . He got it out of his system by following the advice of Dr . Vera Juarez . ( TV : " Rendition " ) The Tenth Doctor was poisoned at Eddison Manor in 1926 but , because he knew it , he made an antidote and saved his life . ( TV : " The Unicorn and the Wasp " ) Behind the scenes . In the real world , such an infection as Sarah receives in " Revenge of the Cybermen " would likely be termed venom , but the serial explicitly uses the word poison .