Oxy's can have tylonel so dont take a bunch. The BEST advice you can get is to go to this site FIRST:
http://www.drugs.com/imprints.php
Type in what is on the pill and it will show you a picture of your pill, what it really is, and what mg it is. If its your first time, I would just take one of any at one time. It will do the trick, youll feel good as hell, you'll have control over yourself, and it would be impossible for the pill to be lethal at one dose. Once you know what one does to you, you can predict what two will fuck you up, twice as hard haha.
And post 420 for me, had to mention it.