Too many times patients are used as guinea pigs. Drugs are administered to patients in a best guess manner, and if that doesn't work, then doctors administer another one. However, DNA testing can be done for certain drugs.

You can be tested for how you produce enzymes that break down certain drugs. There are 4 levels that they test for; either your body really processes the drugs and they are not effective for you for what they are designed to do - or, on the other extreme, your body is very slow at the breakdown of those particular drugs and you end up being over-medicated. The latter is the most dangerous - doctors typically don't monitor those drug levels to adjust your prescription.

Genetic tests could prevent drug reactions - Genetics - MSNBC.com

Again, I say. . . it is not drugs you are lacking if you have a condition, it is essential nutrients. Your body is a miracle designed to keep itself in good health if you give it what it requires to do that.

My disclaimer is - sometimes we need the drugs to keep us alive - but do find out what the problem is - what you are missing in your diet and eat that.

Note also: that you MUST supplement. Toxins and depletion of soil nutrients means that your food isn't what it used to be.