Tetrodotoxin
From Tardis Wiki, the free Doctor Who reference
Tetrodotoxin was a powerful drug that existed on Earth in the 20th century. It was noted for its use by cultures in Haiti to turn people into zombies, as it lowered their senses and put them in hypnotic, lower consciousness states. It was similar to another drug used by Usurians to maintain their slaves on their buisness planets. (NA: White Darkness)
