Coming out of nursing home after surgery on foot. MD at home prescribed atenolol,50 mg plus hydroclorothiade, 25 mg, each once per day. Previously ( prior to surgery) my PCP prescribed a combination pill, atenolol/chlorthalidone 50mg/25mg, and I still have nearly a full bottle of these pills. Are they basically the same? May I take my old script rather than having two new prescriptions filled?