Experiences - 10mg Phenazepam IV: safe for dental sedation?

[Bikini]

With my shaky nerves, I avoid dentists at all costs, however, the other day a filling fell out and so I checked in to a Moscow clinic. They told me that they'd have to drill, so I asked if I could be prescribed something to calm me down—just a pill or two.

They referred me to the anaesthesiologist, who said he would give me some Atarax to be taken on the morning of the procedure, and that then he would give me some IV Phenazepam when we were up and running.

I asked if some Xanax or Lorazepam might be a simpler way to go, but he replied that by mouth, these wouldn't have the required anxiolytic effect. "Phenazepam will do the trick, and Atarax will synergise nicely."

I asked if he minded me Googling the drug and he was very happy for me to do so. I wondered about drinking the night before, and he told me "Please, don't worry. Two or the hundred grams of cognac will help you sleep."

...

Unfortunately, I did Google the drug and read some horror stories, some of them from this site, so the next day, when he was about to inject 10mg into my arm, I freaked out a little. All he said, was that the next time, he would forbid me from researching on the net before a procedure. All in good humour—a very nice fellow!

The sedation was wonderfully effective and the procedure went ahead extremely smoothly. After a cup of coffee and paying the bill, I was let free, actually feeling really good.

...

Sorry for boring you with my tale, but I have two questions:

I've read here some posts that have pointedly advised caution with Phenazepam taken orally at doses less than I received intravenously. Certainly, the drug took a while to wear off, but I was able to leave the clinic unassisted and have a more-or-less normal day after a bit of a rest.

Secondly, at this expensive Russian clinic, the sedation was free, as "We want you to feel comfortable and happy to return." From what I understand, at a Western clinic, sedation is a bit of a deal and costs quite a lot.

In short—why the caution about Phenazepam in the threads I have read here (I'm new here, so maybe I have missed something ), and why is dental sedation the expensive exception in the West (where I come from).