Hi, I had a camera down the throat two days ago and was looked after very well by the nurses,
Everything is explained to you before it happens.
I put on the form that I wanted sedation as I understand that the tube makes you gag a lot when being inserted.
The nurse then explained that they spray your throat first to numb it and then give the injection to make you feel relaxed and a bit woozy.
However, I remember removing my dentures, getting the spray, the injection and seeing the large TV screen at the side of the bed and then nothing until I came round. They'd even replaced my dentures,
I was then given tea and toast and had to wait a short while until I was collected by my daughter with whom I had to stay with for 24 hours.
If the injection is a standard dose then I assume it won't affect a large person like it does a small person. I'm smaller that the average person so consequently it knocked me out completely for which I was very grateful.
I know how worrying this procedure can be so I hope this helps you.