The overdose came days after the singer was named in court documents by Paula Cook, who accused Fantasia of having an affair with her husband, Antwaun Cook.
Brian Dickens, Fantasia's manager, said in a statement Tuesday that winner was "overwhelmed by the lawsuit and the media attention."
"Last night, Fantasia was hospitalized. She took an overdose of aspirin and a sleep aid. Her injuries are not life threatening. She was dehydrated and exhausted at the time," he said. His statement did not specify where she was taken and he did not immediately return a call seeking comment.
In the statement, Dickens acknowledged that Fantasia had a relationship with Cook for 11 months, but said that Fantasia believed Cook when he said "he was not happy in his marriage and his heart was not in it. She believed him when he told her he and Mrs. Cook were separated late in the summer of 2009."
After reading the filing from Paula Cook, Dickens said "there is plenty (Fantasia) does not know" and added that she's heartbroken over "any pain she may have caused."
Fantasia, who won the "American Idol" crown in 2004, is due to release her third album, "Back to Me," on Aug. 24. She was supposed to do promotion for the album this week; a Wednesday interview with The Associated Press was canceled earlier Tuesday.
Dickens noted the album release in his statement and also referred to one of the album's songs "I'm Here," which talks about being thankful for easy and hard times.
"Fantasia sends her praise to God and her eternal gratitude to her fans, friends, and family," Dickens said.
Since winning "Idol," the North Carolina resident has endured success as well as difficult times. While she's had both platinum and gold albums and starred on Broadway in "The Color Purple," she fell into legal troubles that almost forced her to lose her home in 2008.
A VH1 reality show, "Fantasia For Real," debuted earlier this year, chronicling her struggles as a single mother trying to support her family, as well as her attempts to jump-start her career, which has sagged in recent years.