Looking at the graph on page 43, I think it suggests that perhaps they're not looking at any drugs that work on dopamine, such as anti-psychotics. From my interpretation of their slides, I think that anti-depressants and anti-psychotics might be a red-herring, and they maybe looking for drugs that have the opposite effects of both anti-depressants and anti-psychotics. So my earlier rambling post looks like it could be a load of nonsense (sorry about that.) Olanzapine (Zyprexa) is on their list of drugs that causes exhaustion and chronic fatigue. (page 44.) But Amisulpride isn't on their list. Looking at slides 44 & 45, I assume that they would be avoiding any drug that causes any 'exhaustion' or 'chronic fatigue' as a side effect. It seems that the only drug on their lists that doesn't cause exhaustion, or chronic fatigue, is Reminyl (galantamine), an acetylcholinesterase inhibitor, used to treat (mild to moderate) Alzheimer's disease. (It works by slowing the breakdown of acetylcholine, a neurotransmitter.) Wikipedia says that it's also used to treat various other memory impairments, in particular those of vascular origin. (Superficially, this does seem appropriate, for both the memory and vascular issues.) But this is pure speculation again, and probably unhelpful, as I'm probably barking up the wrong tree. They just haven't given us enough information to know what they are getting up to.