Some of the teenagers used salt to separate the alcohol from the sanitizer, making a potent drink that is similar to a shot of hard liquor.

“All it takes is just a few swallows and you have a drunk teenager,” said Cyrus Rangan, director of the toxicology bureau for the county public health department and a medical toxicology consultant for Children’s Hospital Los Angeles. “There is no question that it is dangerous.”

Although there have been only a handful of cases, Rangan said the practice could easily become a larger problem. Bottles of hand sanitizer are inexpensive and accessible, and teenagers can find distillation instructions on the Internet.