I've always wondered why the dingbats trying to make it blow themselves up. More than one building around here has gone sky high via chemical illiterates. Don't they do even a little research?
As the government makes the perfectly legal things used to make it harder to acquire, people have turned to more and more dangerous methods, recipes, and ingredients. Coincidentally enough, the laws used to 'reduce harm' from these drugs have likely cost more in enforcement and actual damages than if users were given reasonable access to these drugs and taught how to use them properly.
Phenelzine is a oxidase inhibitor and used to treat symptoms of depression and anxiety. Demerol is drug given to relieve pain. If the two are mixed together it causes Serotonin Syndrome that can be fatal. You'd have to look into those drugs and how they are given if you wanted to use them. I don't know that much about medicine accept from what I've read for past projects.
Drilling to the bottom or pulling a tooth with the roots without anaesthesia isn't that bad if you can control your thoughts. It's all about believing in the suggestion, so if you imagine your arm burning, you will feel the heat until you can't stand it. Pain is the sum of gathered evidence in a plastic learning system rather than a direct signal, so it's possible to treat using a combination of hypnosis and placebo, because evolution cheated with the evidence gathering and looks directly at the thoughts and beliefs that coorellated well with the ground truth. The alternative would be redoing complex calculations on the hierarchial 3D feature graph from the visual cortex. I learned all this from spatio-temporal deconvolution artifacts (running walls) caused by my sleeping pills.
I think you misunderstood my post. I was answering the question of why the character originally had the meds to which they became addicted...not looking for a suggestions as to how to treat an addict's pain. That's something I'd leave to addiction specialists.
You say the character is an addict so I assume they abuse the two meds you’ve mentioned. An opioid and a benzo. I wouldn’t expect someone who regularly abuses these particular meds to experience a particularly serious incident by taking two of each. Rate of absorption and effect would depend on tablet dosage, tablet coating, tolerance and body weight, but two of each isn’t really that much for an addict. Typically when someone mixes an opioid and a benzo they’re looking to recreate the high they used to get from simply taking the opioid, rather than treating symptoms.