Few drugs will be swallowed.

John Elfreth Watkins : engineer
Few drugs will be swallowed or taken into the stomach unless needed for the direct treatment of that origan itself. Drugs needed by the lungs, for instance, will be applied directly to those organs through the skin and flesh. They will be carried with the electric current applied without pain to the outside skin of the body. Microscopes will lay bare the vital organs, through the living flesh, of men and animals. The living body will to all medical purposes be transparent.
Not only will it be possible for a physician to actually see a living, throbbing heart inside the chest, but he will be able to magnify and photograph any part of it. This work will be done with rays of invisible light.

Tom Geoghegan. "Ten 100-year predictions that came true", BBC News Magazine. 11 Jan 2012. http://www.bbc.co.uk/news/magazine-16444966