1. If you want faster onset, I suggest Xanax (alprazolam). But if you only have diazepam (valium), go for step 2.
2. You should time the onset of the valium since everyone have different onset of the same drug. I assume you had 5 mg tablet, so you have around 60 tablet. Here's how you do it:
- Make sure you're alone or have someone you can trust nearby. You can do this by recording yourself if you want to.
- Prepare yourself a stopwatch and a tablet of valium.
- Take the tablet of valium and start the timer immediately. Stay relaxed but don't do any activities that can distract you (eg. cooking or watching tv) after you take it.
- Take notice of your body's feelings. If you suddenly feel calm, relaxed, or drowsy, please stop the stopwatch immediately. If you record yourself, pause at the time you start to feel the same feeling.
- If you're unsure of your onset time, you can do this on the next day so the diazepam clears itself first before you start over.
The time you're starting to feeling calm is your onset of valium. Let's assume you have 15 minutes for valium to sedate you.
PS: You can try the same if you had other sedatives like Xanax
3. On the day you CTB, here's how you do it:
- Make sure you had taken your antiemetics and prepare the SN and valium solution. Make sure you had the timer around 10 minutes (or roughly 75% of your onset time)
- Drink the valium solution and set the timer immediately.
- When the timer ends, drink the SN so that you're still conscious to make sure you're drinking all of it.
- Lay back and relax as you've passed away
As for the vomiting risk, it has been noted as a risk on sedation. Here's a reading if you want to read it:
Pulmonary aspiration under anaesthesia is a feared complication. It is likely that the incidence of aspiration occurring during procedural sedation is underreported; although rare, fatalities do occur. The supine position increases the risk of ...
pmc.ncbi.nlm.nih.gov
I do think this can be prevented by fasting and eating antiemetics as the protocol suggests. However, I do want to point out to the position after you've drinking SN and valium:
1. You should make sure your head is higher than your stomach to make sure your gastric contents stay below your mouth and preventing vomiting. I highly suggest you sit upright with your body and head leaning on a hard surface. The best example I can give is when you're sitting on an office chair.
2. If you're forced to sleep, make sure your head is supported by a pillow so the head is higher than your stomach is.
As for propranolol, I do think you should add that with your valium solution. It works to calm your heart and in a way calm your SI before you've CTB.