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I don't know the answer to your specific question BUT can offer some thoughts and suggest some additional questions to ask your doctor that may lead to the answer you "really" want (what's causing your fatigue and what can be done about it). (1)  A diagnose of ADD/ADHD does not mean that's the source of any and all symptoms you may ever experience.   (2)  Since there is no real definitive test to conclusively diagnose ADD/ADHD, it is more of an "art" than a science as there are quite a number of other conditions which share similar symptoms. (3) If your doctor AND your own research indicate that extreme fatigue is NOT a known symptom of either ADD/ADHD OR of known side-effect of medications you may be on, ask your doctor for a lab requisition form to rule out other causes (or better yet, go to a Hematologist at least to have the test results analyzed.).   4.  Specifically, ask your doctors to do blood tests to check your Ferritin, Total Iron Binding Capacity, a Differential CBC (breaks down a "standard" CBC even further for specific proteins), glucose tolerance, RNA and a liver function panel. - ADVANCE WARNING - a lot of doctors will balk at that especially doing all at the same time, which is why I suggest going to a hemotologist. The reason for doing them at the same time is that what often may be considered a "normal" result when put in context of results of the other tests can actually be a symptom of a serious problem.   5.  FYI, to put my comments into perspective, I am NOT a physician nor in the medical field nor was I ever diagnosed with ADD/ADHD (most likely because I was too "old" by the time that became a recognized diagnosis. BUT I do have first-hand experience spanning  54 years (eek!) with every single one of the common and not so common symptoms of ADD/ADHD - as well as a grocery list of other symptoms, INCLUDING "extreme fatigue".   6.  I won't bore you with the grocery list of conditions I was finally and definitely diagnosed with but the common thread appears to be "Hereditary Hemochromatosis" (sometimes referred to as "Iron-Overload Disorder" or "HFE"). There is actually a definitive test for it but because it involves sequencing your DNA, it is expensive and if shown positive, the other tests are still needed to determine which organs and systems have been affected.   In my case, while the Hereditary Hemochromatosis is not the direct cause of my symptoms, it predisposed me to certain diseases and conditions, including some which mimic ADD/ADHD, which eventually destroyed my immune system and now my white cells think my red cells are the enemy and so are destroying them left and right - and THAT is the biggest factor causing my "Extreme Fatigue".   IMPORTANT!   I've been told that the severity of my situation is fairly rare even for those who have been diagnosed with HFE, so I pray that I have not caused anyone to be unduly alarmed. HFE can actually be treated quite easily if caught early enough. That's the key and why I'm trying to help spread the word. Your being a proactive "partner" with your doctors is the best gift you can give yourself AND your physicians.     Good Luck and G-d Bless!