Tablets are just one way medicines can be taken | image from Wikimedia commons
Scientists are coming up with new treatments for diseases and illnesses all the time, many of which will be a new drug. Discovering a new drug could start from many places: modifying the structure of old drugs, studying organisms that cause disease to find weaknesses, computer modelling of completely new molecules, testing what compounds found in nature can do, and some drugs are even found completely by accident.
In this zone there might be scientists working hard trying out thousands of different molecules in order to find what affects a particular disease, or working on clinical trials making sure that new drugs work and are safe for us to use