This medicine is tylenol (acetaminophen,paracetamol) combined with codeine, which is a naturally occuring opiate and is therefore a narcotic like all other opiates/opioids.
Although it is weaker than oxycodone (OC, Percocets) and hydrocodone (Vicodin), it can still give you a really nice opiate buzz if used in higher doeses.
This medicine comes in four different strengths:
Tylenol 1,2,3, and 4 which all have different amounts of codeine but the same 300mg of tylenol per pill:
Tylenol 1 = 300 / 8
Tylenol 2 = 300 / 15
Tylenol 3 = 300 / 30
Tylenol 4 = 300 / 60
These are the most common doses and are commonly nicknamed T(number), for example T3's
In the UK, Tylenol 1 and 2 come in over-the-counter form as in the US, all of these are prescription.
No doubt, these pills are still really nice to have prescribed for a minor injury, but the reason they are a "tease" is because for those (myself) who try to get high off of the codeine basically have to fucking overdose themselves (myself...) on the tylenol before getting the same buzz.
Don't get me wrong, you can still get a nice buzz off of only 100-200 mg's, but after very few times, tolerance kicks in fast and you have to take toxic levels of tylenol before you can get a nice opiated buzz.
Many people get liver damage all the time and aren't even aware, but after multiple doses, it can get severe and in higher doses, people end up in the hospital or dead.
There is a way to do a cold water extraction to seperate the codeine from acetaminophen, but you lose a lot of codeine doing so, until you can get better at it.
S: Yo man, got any T2's left I can have?
E: yeah, I still have 4 or so.
S: Sweet can I pay you for all of them?!?
E: well yea.. but 4 T2's won't do shit.. like jack shit.
S: ...that medicine is such a fuckin tease..