Dear Dolphingal, your very smart worrying about your kidneys and liver...stay away from percoset..percodan...vicodin...etc. Pain medication with no tylenol or asprin to kill your organs are...Msir(Morphine Sulfate Immediate release)a little less powerful than Oxycontin. There is also Oxy IR which is percoset without the Tylenol. MScontin is also free of asprin and Tylenol. MScontin(Morphine Sulfate Continu Release) Diluadid also has no Tylenol.NEVER lose your pain doctor!!They are soooo hard to find... If you don't want to take your pain meds now, keep and store them until you do need them. You never know when the cold hand of pain will be tapping you on the shoulder!! Good luck!