Ah, yes, I always look to Twitter when looking for a reliable vetted source of news.
Midazolam is a benzodiazepine used as an anti-anxiety drug before medical or dental procedures. It is sometimes used to relax people who are nearing the ends of their lives. It can also be used to treat seizures.
https://www.drugs.com/mtm/midazolam.html
It is used in sedation dentistry usually in pill form, maybe 0.25-0.5 mg. It is very potent and has a short half-life, so you come out of the “daze” much more quickly than say Xanax or Ativan or other popular benzos. It is also used via liquid IV for pre-operative relaxation, before the anesthesiologists hits you with the heavier stuff.
If you keep administering it over a long period of time, to very sick or frail people or people on mechanical ventilators I could see how some may just stop breathing while they sleep. But with its shorter half-life they’d have to either keep you on a drip of some kind or hit you with a heavy dose (or both). I’ve had the drug a few times - before dentistry once, and twice before going under for surgery.