I wonder what would have happened if antibiotics existed earlier, like in the Middle Ages. What do you think would have changed?
closed as too broad by ArtOfCode, Jason Hutchinson, MichaelHouse, DaaaahWhoosh, AndreiROM Feb 19 '16 at 18:46
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Worldbuiding is a site dedicated to the problems which writers encounter when they invent their fictional worlds, be it for a novel, a game, or whatever. It does not deal with the real world, and it does not help people to come up with ideas in the first place. You are a new member, so I'll try to give an answer anyway.
- Antibiotics have to be mass produced in reasonable quantity at reasonable prices to have a large impact. Are you assuming that pharmaceutical factories exist, or are you assuming that they are not necessary to get antibiotics? For instance, there could be a natural source in a plant.
- Antibiotics alone won't improve healthcare. Will there be a soap supply? Germ theory of disease? Sewage treatment plants?
- Incorrectly applied, antibiotics breed resistant germs. Can the people read the instructions?
For these reasons, I believe that there would be a minor reduction of mortality from sickness, but not enough to bring sweeping changes. The upper classes will benefit most. The random survival of some prince or princess could lead to sweeping changes in history, but not to changes in the economy and general quality of life.