Overworked. Overstretched. Exhausted. However you say it, it’s leading to a worrying number of medication errors in Canada.

A new study released by Statistics Canada found that nearly a fifth of the country’s nurses made mistakes in medicating patients "occasionally" or "frequently." More specifically 22% of those who usually worked overtime reported making errors, while 14% who did not work overtime admitted to the miscues.

The survey took place between October 2005 and January 2006 and involved 19,000 nurses across the country.

Sources: The Canadian Press, The Chronicle Herald, and CBC News.