A sort of invisible pill, prescribed by anyone. Some idiots think that they could buy chill pills online, who on earth knows whether it works.
Guy (whacking a person with a newspaper): What the f**k is this you f*****g idiot f**k off graah!
Guy who just got hit with a newspaper: What the... take a chill pill, person.
*Guy still whacks the person with a newspaper then gets thrown out and has the chill pill*