Lacey Wickline said in a statement issued Monday the one-time teen star is "recovering fully and speedily," CNN reported.
Wickline said Capriati, 34, is listed in stable condition, but didn't say where she was or provide any other details of the overdose, which Wickline said is thought to have happened late Saturday or early Sunday.
"In response to the outpouring of concern and support shown by Jennifer's friends and fans worldwide, we would like to acknowledge that Jennifer is recuperating at a south Florida hospital from an accidental overdose of medication prescribed by her personal physician," the statement said.
Capriati, who earned $1 million before turning 16, has had a history of drug problems and depression and dropped out of tennis for several years starting in 1993.
She returned to win three Grand Slams (2001 and 2002 Australian Open, 2001 French Open) and a gold medal at the 1992 Olympics.