> he has been acting impulsively ever since his controversial detox treatment in Russia
"dependence on a potent anti-anxiety medication"
When people get a treatment, means they had health problems. In this case the problem was with the brain and psyche, hence behavior.
Higher impulsivity and irritation, besides possibly being among initial issues which were reduced by sedative meds, those can be among consequences of stoping long usage for sedative meds. The brain reduced natural abbility to suppress redundant activations, as this function was taken by sedative meds. This problem can be fixed not completely. Also he may use meds in now time with side effect on behavior, making it lesser restrained and lesser cautious (as may antidepressants and antianxiety meds).
He may have changed life conditions which predispose him be more aggressive in actions.
Besides negative changes, he could become more assured after psyche improvement to do more than before. Could to know and understand more. So then to say what he thinks as important about what he did not before or how did not before.
Then "acting impulsively" you evaluate by medias data. It's not good source to decide this, as medias are prejusticed to filter and exaggerate.
> controversial
It needs to know details of what was done and preferably to have medical education to say that as harmful, doubtful or even unusual. Psychiatry medicine in Russia is similar to what exists in USA.
Also the problem situation here could be "Russia". If a treatment was done in France, that would not be so "controversial". There happens hithleristic anti-Russian propaganda in USA & Co medias and territories of today, similar to what was in Germany against Judaists.
Did not checked much about him, but may suspect he's taken as one of victims for social terrorism. Mb based on his politics related activity or other. To attack his professional activity only because he said publicly something unliked about someone - reminds this approach.
I notice that in USA (and other places) is popular social terrorism by political reasons. People are restricted to get incomes when do what is not wished by some of politicians or by other who have some power. Those can be attacked by mass medias gossips or delusional explanations about not fiting to professional norms.
The similar happens much in today sport, when by political reasons and against formal laws Russian sportsmen were forbidden to take part in competitions.
It's general liers and social terrorists approach, when gossips and delusional accusations are used to attack people when they do something what was not liked by those who controls medias, money, etc. During this are ignored common laws about social descrimination and others. USA & co reminds more openly the world of Big Brother, where evident lie and madness become as norma.