Well, there is an emerging field called pharmacogenetics where certain gene characteristics are related to the efficacy or more likely the side effect profile of different medications. There are attempts to bring this into clinical practice, where people can be screened for certain genes which would indicate the potential for more severe side effects for a certain medication, suggesting an alternative should be pursued instead. It's still new, so it's still under development, but it's being done in some research context and will probably be pretty common in about 10 or 15 years

I'll research is difficult and takes a long time and hard work. Very little research helps anybody except for in a long time. But then suddenly it does help, often in dramatic and life-changing ways. But science is hard, and implementation is one of the hardest parts