X-Drugs are like a stronger form of LSD. So strong, in fact, that they grant the user a certain amount of superpowers – including telekinesis, teleportation, intangebility, reversal of personal gravity and super-speed – while they last. A standard dose lasts a short time – an hour or so – and reportedly, the experience is quite a rush. Despite the name, there is in fact only one X-Drug, although it is often tailored to the DNA of the user for maximum effectiveness.
The principle by which X-Drugs operate is based on an unusual interpretation of certain aspects of quantum physics, notably Heisenberg’s Uncertainty Principle. They allow the user to make the apparent manipulation of reality by consciousness under LSD to be an actual manipulation, albeit of a strongly limited nature.
X-Drugs were created by an unamed former faculty member at UC Berkeley, and later improved by both the Scary Clowns and their enemies, the Troop.
No, actually, all of the above is a lie: there are no X-Drugs: they are fictional even in the context of the fiction in which they appear, and their effects were simulated by the Scary Clowns for their own purposes.