Your GP knows what other drugs you are on (maybe not in your case) and can tell you about counter-indications when combining them. Could easily save your life.

But go ahead, see a witch doctor and a herbalist and take some random medication you read about in the internet.

Hopefully your GP can tell you about counter-indications when combining drugs. There is a lot to stay on top of as so much new research is being done so often. Also, things like pharmacogenetics are often not considered to the extent that they maybe should be. In taking drugs, I'd say do your own research and talk to your GP.