Chemical patch

By 5,000,000,023, chemical patches made from cellophane were used by the people of New Earth for the administration of medicine. Specifically, mood patches became popular in the New New York Undercity, where they were sold in Pharmacytown. (TV: Gridlock)

Behind the scenes
In the real world, transdermal patches have been used for the administration of medicine since the 1970s, first being used for motion sickness, before expanding to birth control, nicotine patches, and even caffeine patches, all of which act on mood, just like the mood patches in TV: Gridlock.