Why didn't the pharmacies la belled the medicine according to the disease and blood type of a person?

Question

I realize that not all people can be cured using the same medicine for the same kind of sickness and I'm sure this is because of the blood differences

Answer 1

This is a known fact that different people can react differently to drugs due to genetic differences. There are some tests for this. However, the drug companies do not want to persue this until the privacy laws have been straightened out in the U.S.