I'm surprised that I find a lot of doctors that prescribe Strattera as the first medication to treat your ADHD, instead of a stimulant. Heck, they prescribed my sister Wellbutrin (an anti-depressant) for her first ADHD medication, and I'm not surprised that it has no effect on her symptoms. She does not have any health or mental health problem that would contraindicate prescribing a stimulant either. The first-line treatment as FDA approved for ADHD are the stimulant class of drugs. Ritalin is only the most well known (due to the massive advertising campaign in the late 80's and throughout the 90's), but there are several forms and formulas of the myriad of stimulants (used for over 50 years safely, FYI).

Strattera doesn't usually work as well compared to the stimulant class of medications. Unfortunately some doctors aren't very educated about ADHD or ADHD treatment (especially in adults), and they have unsupported "beliefs" about stimulants, which usually consist of: 1) the adult is drug seeking, and/or the doc wants to rule out drug seeking behavior; 2) stimulants will make the patient a drug addict/dependent; 3) they believe that ADHD doesn't really exist; 4) they are trying to please the patient or the child patient's parents, without causing what they erroneously believe to be harm to the child (by prescribing stimulants).
I'm sure there are more reasons but that's off the top of my head the most common ones. Sigh-- ignorance prevails sometimes even in psychiatry.

Sometimes they are legitimately not prescribed, depending on the medical history of the patient. If a patient has ADHD and Bipolar Disorder (1 or 2) for instance, in many cases it is contraindicated to prescribe a stimulant as it can cause serious problems for the patient with Bipolar. If they do prescribe it for a patient with ADHD comorbid to Bipolar then they are closely monitored. I'm sure that they probably (but I'm unsure) do the same for folks who have comorbid psychotic type disorders. Another reason to prescribe something else in place of a stimulant is if they have a health condition like a heart problem or thyroid disorder that might be severe enough to contraindicate it (but even with those problems, they can oftentimes still prescribe a stimulant).

Are you seeing psychiatrist or family doctor/general practitioner/other practitioner? Do you have any other disorder that might be complicating your ADHD treatment (and account for the Strattera not working well)?
There is no guarantee that a stimulant would work better, as it's a question of trial and error adjustment, and just as with all medications, sometimes people have side effects that outweigh continuing the drug.
I hope your doc really finds something that works for you. If he doesn't, I would personally find another doc-- from what I know now about ADHD and it's treatment (and I make it a point to learn as much as I can), and actually the psychiatric system in general, I don't waste any time with doctors who I discover don't know that much about my disorder (common).
Anyway, that was far longer than I wanted it to be! Good luck!!!!