Bad nausea when taking oxycontin.

SWIM has only taken Oxy’s a handful of times (5 or so), and every time he takes over 10mg’s he gets bad nausea and throws up several times throughout the experience. SWIM has never taken over 25mgs because it makes him so sick, he recently tried doing 10, then another 10 two hours later, but still threw up. It really ruins the high when you feel nauseous, SWIM will feel much better after he throws up and can enjoy it for a while, until the next wave comes. Is this normal? SWIM has friends that do 20-40mgs at a time with no problems. They also don’t do it regularly so SWIM does not think it’s a tolerance thing. Should SWIM try it on an empty stomach? In the past he has always eaten an hour or so before doing it. SWIM might just stop messing with the stuff anyway, in a way its good that SWIM cannot really abuse it and fully enjoy it, because an opioid addiction is not a road he wants to go down.