Scientists have identified genetic variations that affect specific neurotransmitter functions, which could explain why some patients respond to some drugs but not to others. For example, some depressed patients who have abnormally low levels of serotonin respond to S.S.R.I.’s, which relieve depression, in part, by flooding the brain with serotonin. Other depressed patients may have an abnormality in other neurotransmitters that regulate mood, like norepinephrine or dopamine, and may not respond to S.S.R.I.’s.

Considering that less than stellar luck I’ve had with antidepressants recently, that sounds like an excellent idea.

Maybe one day they’ll be able to do the same with other medications as well–I’d think it would be far easier to get a drug plan to pay for a medication if a doctor days that’s the medication that will work best for you.