At least three kids have died after doctors gave them a normal dose of codeine after surgery, the US Food and Drug Administration announced today. Codeine is a common painkiller that normally turns into morphine in the body, Reuters reported. But as many as 7 percent of kids may be "ultra-metabolizers" of the drug, causing a fatal overdose even at normal amounts.
In a press release, the US FDA says it is studying adverse affects reports to see if yet more codeine-related deaths have occurred over the years.
More from GlobalPost: When the BRICs crumble
"When prescribing codeine-containing drugs, health care providers should use the lowest effective dose for the shortest time on an as-needed basis," the release says. Certain ethnic groups may be more likely to be fast metabolizers of codeine. Genetic tests can identify the ultra-rapid metabolizers, but most pediatricians don't bother ordering them, the Boston Globe reported.