Preparing for periodontal surgery appointment and reviewing my sedation options. Lorazepam is not an option, it makes me shake from head to toe so that they can t work on me, and the sedation benefit takes too long to kick in. Diazepam and nitrous has been useful in the past but was not so effective at the last procedure. So - my question at last - Halcion was proposed. I haven t had it before. Any way of judging, ahead of the procedure, how likely this is to work for me?