No. Tylenol usually isnt part of any long term pain management plan, especially in patients with neurologic/spinal cord injuries.
It's very useful for short term pain management. You give it as a combo with narcotics to decrease the necessary narcotics dose for adequate pain control. This prevents a lot of the crappy side effects from narcotics such as constipation, nausea, altered mental status and addiction potential.
Patients with true chronic pain (which is realy really hard to diagnose if its just ambiguous low back pain), often have pure narcotic pain control regimens such as ms contin, fentanyl, methadone etc.
Acetaminophen containing drugs can be used as part of long term therapy, but not as the
primary medication.
To answer "Why is Tylenol in everything", adding a second medication to oxycodone and like drugs helps more than oxycodone alone.
Why acetaminophen (Tylenol)? Because of a few reasons. First, this medication has been out a long time. You had a choice of two drugs with which to formulate a medication, Tylenol or aspirin at that time. Very often it was given to a patient for an inpatient procedure. The last thing you wanted to do was give a patient something which could muck with anticoagulants or worsen stress induced GI problems. That's why you don't see aspirin used in anti-inflammatory doses anymore. It's a bad choice.
So that leaves acetaminophen, which was thought to not effect anticoagulants (not true BTW, but it's still far less than aspirin) and leaves the GI tract pretty much alone. In other words it's the better choice.
What follows into the community also applies if to a lesser degree. NSAIDs (of which aspirin is one) still screw with the above conditions and other medications and therefore narcotic/APAP (APAP is a common abbreviation for acetaminophen) is often favored.
So why the big shift away from Tylenol? Well someone woke up to 1970 at the FDA. Acetaminophen is still a good choice for many people but it turns out to be more toxic than originally thought when combined with alcohol. That's bad.
Then there is the ubiquitous presence of it in other types of medication which can be purchased without a prescription. It's not just a pain reliever but a fever reducer.
So imagine this. The 24 hour acetaminophen maximum dose for a healthy adult is 4000 mg. That's an unbreakable rule in medicine.
Let's say that you were prescribed Percocet with 325 mg of acetaminophen. , the most common. That means 12 a day tops. The doctor writes directions to reflect the maximum dose. All's well until the medicine isn't quite making it. Well let's take some Tylenol. Two 500 tablets a couple of times a day. Then there's that pesky cold. That multi-symptom cold formula sounds great. Oh, while I'm out shopping lets get some beer for the game on TV tonight.
Well you are now looking at a potential disaster. Suddenly the FDA says "whoa" after the better part of half a century and starts sending out all these messages that acetaminophen isn't as harmless as first thought. Go figure.
Docs? Many aren't much better. They'll go for a combination drug because that's what they've always done. Besides there is the abuse issue here. Someone who is addicted or has been taking large doses of opiates could swallow enough of narcotic and be OK that would literally kill them if combined with acetaminophen. Even if they disregard that there's the pesky DEA which frowns on practitioners prescribing stand alone narcotics. Of course officially they don't, but they lie. They aren't concerned with therapeutics but drug abuse.
Anyway, that's more than you asked for OP.
The way to treat chronic pain with opiates and related drugs is to use a long acting medication to get constant coverage and
add a second shorter acting one for break through pain. That's when the Percocet or single ingredient medication would be used. It NEVER should be used as the primary drug for severe chronic pain.
One other thing, the goal of pain management is NOT to be pain free, but to provide relief such that you can do whatever you need to do within reason. You can walk or work or whatever, but never expect to have no pain at all. That's not realistic, sorry.