WATCH: A section from Consuming Kids which reveals just how marketers target children, not parents, with ads for kids’ toys.

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NEW YORK (CNN) – U.S. safety officials have recalled about 4.2 million Chinese-made Aqua Dots bead toys that contain a chemical that has caused some children to vomit and become comatose after swallowing them.

Bindeez, which were named Australia's toy of the year, contain a chemical that converts into a "date rape" drug.

Scientists have found the popular toy's coating contains a chemical that, once metabolized, converts into the toxic "date rape" drug GHB, or gamma-hydroxy butyrate, U.S. Consumer Product Safety Commission spokesman Scott Wolfson told CNN.

"GHB is this drug that in low doses actually causes euphoria," said Dr. Sanjay Gupta, CNN's chief medical correspondent. "In higher doses, it can cause people to go into a coma. It can cause seizures. It can cause something known as hypotonia, where all your muscles just become very flaccid.

"And it can cause people to become amnestic, meaning they forget everything that's about to happen to them, which is why it became a date-rape drug," Gupta said.

"So this is nasty stuff, and it appears that the chemical is actually converting into it in the body."

The arts and craft beads, aimed at children 4 years and older, have been selling since April at major U.S. retail stores as "Aqua Dots" and in Australia under the name "Bindeez Beads."

Anyone with Aqua Dots at home should throw them out, CPSC spokeswoman Julie Vallese said. The toy was named toy of the year in Australia and recently made Wal-Mart Stores Inc.'s list of top 12 Christmas toys.

Wal-Mart on Thursday listed Aqua Dots on its Web site as "out of stock online" and had removed them from its top toy list.

Toronto-based toy distributor Spin Master Ltd. stopped shipping Aqua Dots and asked retailers to pull them off their shelves, where they had sold for $17 to $30. Watch what's known about the beads »

Toy contaminated with 'date rape' drug pulled - CNN.com