Does Zelax 10m cause Sodium to be reduced. ? in...

Does Zelax 10m cause Sodium to be reduced. ? in case yes. Can you suggest a replacement. The patient is 79 years old women. admitted at hospital because sodium was 109 then the hospital managed the case and increased the sodium to 135 but the doctor said that she is suffering from a simple depression for which he suggested Zelax 10mg .