Hallucinogenic lipstick

Hallucinogenic lipstick was a type of lipstick available in the 51st century. It was notable for creating hallucinogenic effects in people kissed with it, though apparently not in those wearing it. River Song used it on an unnamed security guard aboard the Byzantium. After finding the guard, Alistair deduced from the lipstick that Song was aboard the ship. (DW: The Time of Angels)