Drug info - Painkillers

[NotImportant]

Swim here.

Swim has a severe knee problem, and the doctor wont prescribe any meds because of swims age. He says he isnt comfortable giving painkillers to 18 year olds. But swim has a big problem with it, and cant do the regular gym stuff in class. Like, for an example, swim can not run without being in extreme pain. The thing is that swims doctor says that it will get better if swim runs and trains the muscles around the knee more. But it feels like hell, and swim just cant run or do anything like that. Swim is therefore looking in on the possibility to get some kind of painkiller that will allow swim to exercise more, and not get the pain. Swim has gotten a little overweight because he cant move as much as he needs and should, and want to change this. He considered the speed dieting, but he would like to exercise first and try that. But for that, he needs something to kill the pain.

I have been looking around the forum, but cant find the answer Im looking for.

So, what would swiy recommend?