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Recommend anyone considering this to ask your doctor about using a sedative instead of general anesthesias. As best I can tell general anesthesia for colonoscopy for low risk appears to be a cultural custom especially prevalent in the northeastern USA. Anesthesia has many more possible side effects than sedatives and ought to be avoided unless needed (this applies to any unneeded treatment). Plus if you’re awake you…
Propofol or ketamine are both safe, low risk, and have minimal side effects when used correctly.
Side note: I was never warned about a particular effect of propofol. They started pumping it in and told me to count down from 10. At about 5, I suddenly felt this horrible searing, burning pain in my IV-connected arm that I felt spreading throughout my body. Thinking something was terribly wrong, I opened my mouth to say I'm feeling awful pain, but by then I was already falling unconscious. So I only consciously felt the pain for a few seconds, feeling totally fine (besides grogginess) when I woke up, but it was panic-inducing and some of the worst pain I've felt.
Apparently it's pretty common for propofol. I think they might have told me I might feel a little discomfort, but they didn't mention the possibility of sudden, dramatic pain, for some reason. I could've grit my teeth through those seconds if I knew it was possibly going to happen, but I feared that I was having an unexpected severe allergic reaction or something, so I spent those few seconds absolutely terrified.