I do not like anything that is not natural. I hate even taking a ibuprofen pill when some muscular or joint pain occurs. Regular exercise keeps me pain free in mid-70’s. was just joking about the fentanyl. I even refuse pain medication at the dentist office. There is one huge adavantage in getting old. The nerves in teeth are pretty much dead and atrophied.
For the colonoscopy, I will advise the anesthetist to be sure and not over-dose me. I read that they will give a cocktail of 3 pain killers, one of them is fentanyl. I was joking with my wife that is a truth serum, so please do not ask me any questions hehe..
Your usage is quite different than a doctor prescribing it for a patient to self medicate. Even for legitimate reasons that is a dangerous thing to do. One reason is because of the fact that the body builds tolerance, and the person may think increasing his dosage to 2 will not be a problem. But increasing a narcotic that powerful can prove to be fatal.