The Irish Pharmacy Union is warning that shortages of medicine are posing a serious risk to the public.
A survey conducted by the union has found that 91% of pharmacists say shortages have worsened in the past 12 months.
The IPU said staff spend eight hours per month specifically dealing with medicine shortages.
The lack of alternatives to out-of-stock drugs is the main cause of shortages.
"It's been a major problem, and something that pharmacists spend many hours … trying to source medicines from various sources to try and satisfy our patients' needs," said IPU President Rory O'Donnell.
"That can affect patients' health outcomes quite substantially," O'Donnell said.