Vraxoin (also known as XYP or "vrax") was a dangerous, addictive drug. It was a grey, ash-like powder that also appeared as a sparkly gold powder (possibly the refined form) which could be taken orally. It was discovered on the Cygnus Rim around 1999; it was consumed by snorting the substance. (PROSE: Christmas on a Rational Planet) The drug caused a slightly drunken effect and apathy, then extreme anger during withdrawal. (TV: Nightmare of Eden) Vrax-users (also known as Vrax-Heads) were also known to become shaky and to lose strength and concentration after taking the drug. (PROSE: Mean Streets) The Fourth Doctor mentioned it had caused chaos on several planets. (TV: Nightmare of Eden)