I was prescribed opana 15 er, After taking for 2 week was hospitalized for breathing problem and abnormal EKG. On my next Dr appt was changed over to the Oxymorphone 15. I had not had any more trouble. In July I was replaced on the Opana 20 mgs ER, Within 4 days I was rehospitalized due to breathing problems, I am taking several medications for my breathing now, I am still taking the Opana ER. NOT getting any better. I returned to my PCP today and my breathing is still bad and had to return to the hospital for observation. I need to know if the Opana is the cause? I did NOT have this problem on the Oxymorphone