Propofol
"Received this horrible stuff for my upper endoscopy. Made my heart race for two days, coughed so much when I came too and afterword for about 10 minutes,  made chest sore, made me a chatterbox and I'm usually a quite person....wasn't sleepy,  I went to bed,  deep sleep, woke up to heart racing and jittery feeling from this medicine,  caused shallow breathing too. It will never pipe through my veins again! I had to drink and drink water to get this junk out of my system. Horrible poison!"