Nursing had become "too dangerous" for Catherine Taylor before she left the profession.

Ms Taylor resigned in April from her job as a nurse in an acute mental health care unit in south-west Sydney.

"It was just getting too dangerous. I felt we were getting a lot of new graduates who were inexperienced and undergraduates who have done a week's mental health training," she said.

"This led to inexperienced staff dealing with highly psychotic patients who would either escalate the situation or not know how to handle it and not report a patient who was suicidal because they didn't want to appear incompetent.