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A post on Quora about how awful the staff were at Briarcliff Manor led me to American Horror Story: Asylum which did seem to be about doctors changing how patients behave. It's about the right time period.
https://en.m.wikipedia.org/wiki/American_Horror_Story:_Asylum
Hmm. I looked at two promos for the series and they don't seem to match what I remember. The promos I found didn't have any narration and the visuals don't include that visual of someone with two vertical cuts on either side of their nose that I remember.
Honestly, I think if I had seen that instead, I would have been more freaked out though.
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I apologize if this isn't enough detail.
Back in 2010-2011, there was this commercial that scared me as a kid, which I think was a promo to a show or something. It had a narrator talking about ways doctors "change the way patients behave" and it had visuals of hospital patients screaming, one of which seeming to have two vertical cuts at either side of their nose.
This is a vague memory, but I highly doubt it was something my brain made up, because my young mind wouldn't have generated something this twisted.