Yes, definitely do NOT eat the cottons, as mentioned. Extract into acidic liquid (I use Snapple usually, or Sprite), or water with lemon juice or if necessary, a bit of vinegar. basically anything acid to get the propylhexedrine freebase oil that is on the cotton to convert to salt form so it can dissolve into the liquid. Usually I get a snapple bottle (wiki strawberry is my favorite but it doesn't matter what flavor), open it, drink a few sips, and then cut or tear up the cotton into little pieces into the bottle with the liquid. Then I close it and shake it up a bunch for 5 minutes. Open it, grab the cotton, which should be a big mass of expanded cotton, and squeeze it out into the bottle. Put it back in, shake it up again for 5 minutes, then squeeze it out again. It should all be extracted/dissolved by then, more time is not necessary. I usually put the cotton back in anyway just in case it will extract slightly more but from there, I can drink the liquid to dose. 1/4 of the bottle is 1/4 of a cotton, or about 62.5mg. half the bottle is 125mg, which is about the highest I like to dose, personally. Higher than that, and the side effects and crash become not worth the effects. I've done a whole cotton before, and it's just too much. I did 2 whole cottons the second time I did it, and I experienced almost instant stimulant psychosis and couldn't pee for over a day, even though my bladder felt about to burst. I almost went to the hospital. It was horrible. I have a feeling propylhexedrine is very bad for your kidneys and prostate.
I use it regularly, much too regularly. This is because I like stimulants and it's just always there, staring at me, in the grocery store. Dosed from 1/4 to 1/2 a cotton, it is a decent stimulant, with not too bad of a comedown or side effects, but it still is pretty harsh for what it is.