The death of junior medical officer Dr William Huynh, 26, who took his own life last January while training at Wagga Base, spurred the hospital to conduct an audit of procedures after it was revealed the young doctor had used the drug Lignocaine before committing suicide by hanging.

The investigation discovered all Schedule 4 drugs, prescription-only medications which include Lignocaine, Valium, Temazepam, Rohypnol, Panadeine forte and some sleeping tablets, were kept in locked rooms with the exception of those on emergency trolleys in resuscitation areas.

Despite the result of the review, Greater Southern Area Health Service (GSAHS) central sector general manager Jill Ludford said further measures were now in place to ensure access to addictive and restricted drugs remained tightly controlled.

"There is always more you can do," she said.

"One improvement to internal procedures we are looking at is to conduct more regular audits and also by making sure we put additional security in the form of keypad access to treatment rooms."

Medication audits will now be conducted monthly while Schedule 4 drug stocks will also be kept at a minimum in some departments to prevent a surplus.

Ms Ludford said Wagga Base Hospital would continue to work to improve drug storage areas and systems.

A coronial inquest into Dr Huynh's death was ruled out, however a report could not identify where he obtained the drug Lignocaine.

It is not known if the drug was obtained from hospital stocks.