Absentee Shawnee Counseling Services Specializing in Painkiller & Heroin Addiction Treatment for both Native & Non-Native Adults. Oklahoma City Methadone Clinic - Outpatient treatment for addiction to prescription painkiller drugs like Oxycontin, oxycodone, Lortab, hydrocodone, Vicodin, Percocet, Dilaudid, Demorral, and other opiates.