Ill health is more than just having caught a bug, and so treatment must take into account these additional factors. Drugs, or essences, may be effective in suppressing infection, but the human body has the ability to fight them without any assistance or interference from outside. If it did not have this ability the human race would have died out many thousands of years ago. And there is a growing and real problem with antibiotics. Because of their indiscriminate use, bacteria are becoming resistance to them.
New strains appear, and new drugs have to be manufactured.
It is a race which, once we have entered it, we can never quit, and it has no foreseeable end. I am not suggesting that essences should be substituted for antibiotics, although this may be a step in the right direction. Any substance which is powerful enough to be effective against a number of different conditions in millions of different people is bound to cause problems. The solution lies, rather, in reducing our dependence on them and paying greater attention to the positive health of the individual. When prescribed individually essences are almost as effective as, and far less dangerous than, synthetic drugs.