4-fa is an interesting suggestion, but it really is more of a serotonergic amphetamine, both pharmacologically and IME, and had little effect on my personal ADD symptoms. You can try it, it most certainly is a stimulant, but it's a really, really odd one - kind of like d-methamp in Desoxyn, but without the "speed." Almost as if the 4-FA energized you in a similar fashion to LSD - in a loose sense, of course!
Also, as a result of my own personal adventures... I REALLLLLLLY recommend against attempting to utilize MXE for any therapeutic purposes. That was my intention back in March when I first began ordering it... a destroyed relationship, failed employment, thousands of dollars, fifteen ounces and 10 months later I find myself in a very, very dark place in my life.
Obviously I cannot blame these consequences of my own behavior on an inanimate object such as Methoxetamine, but it truly acted as a profound catalyst for the total implosion. Steer clear. Also, ADD treatments are theoretically going to help you focus and be 'normal.' Things are anything but normal, both in reality and cognitively, in an MXE (or other like-street drug) haze. I'm in agreement with others here, using research chems to medicate a legitimate diagnosis is not prudent.
~ vaya