It is a similar medication to Oxycodone and Oxycontin. Purchase Roxicodone online overnight for severe stomach cramps. Take Roxicodone directly by mouth with or without eating; the Roxi pill is stated to work for 15-30 minutes. Available in three different forms: Roxicodone 5 mg + Roxicodone 15 mg + Roxicodone 30 mg help to reduce pain instantly.