My Father Was Recently Diagnosed With CHF. She Was Started

My father was recently diagnosed with CHF. She was started on Cozzar 25mg daily and Metoprol12.5 twice per day (25mg daily) along with 40 mg Lasix two times per day 8AM & 8PM (80 mg daily). Now after taking the medications for over 1 month (about 5 weeks), we are being told that he has developed Kidney Disease and the lab results, BUN, Creat., and GFR are getting worse. Question: Which of these medications is worse/more toxic on the kidneys?