It is slightly
stronger on D3 than D2 but is the difference really enough to call it selective?
For example
quetiapine has a roughly similar slight preference for D2 over D3 but induces terrible akathisia too at moderate-high doses.
Stupid question but did you
@Gaffy experience psychotic symptoms which lasted significantely longer than the effects of the drugs you took, for that you were put on haloperidol?
Lack of concentration and short attention span sounds like ADD, which is probably too little dopamine in the frontal lobe and why stimulants help but at least I tend to question why to block the DA receptors at first just to use another drug to increase activity at the very same receptors. Ok, it's more complex and possibly different drugs affect different brain regions differently so good if you get better results this way.
Haldol is really one of the heaviest antipsychotics still used, gave me dyskinesia from just 1mg which required anticholinerges. Imo it's a last resort for non-responders and some/many docs keep it this way. As ibtisam wrote, if you
require an antipsychotic, there are better tolerated alternatives - maybe a partial agonist like aripiprazol, low doses aren't particularly anhedonic and should be better about akathisia and ADD too.
Don't know the exact way why benzos help but guess akathisia will be mediated by a glutamatergic excitatory circuit which GABA counters. There is an increase in glutamate in tardive dyskinesia (described e.g.
here, had a good source about glutamate-dopamine interaction which I need to search) and yeah, dopamine both calms RLS as it increases locomotion. Analog to how DA can cause compulsive behaviour and at the same time improves attention and decision making - the tendency is that too less is horrible, a little is good, some is rewarding but more becomes horrible again.