Amy Winehouse was released from a London hospital Tuesday after an overnight stay to treat what her spokesman said was an adverse reaction to medication.

The 24-year-old singer-songwriter was discharged from London's University College after spending the night in observation, said spokesman Chris Goodman.

Winehouse was rushed to the hospital's emergency room by ambulance from her north London home Monday night. Goodman said the medication had been taken at her home, but did not provide further details.

"She had a bit of a scare yesterday because of a reaction to treatment. She was kept in overnight purely for observation," Goodman said in a statement. "Amy is at home now after leaving with her father and manager. She is having a rest."

Winehouse, who won Grammy Awards and global acclaim for her 2006 album, "Back to Black," was admitted to a London clinic in June after collapsing at home. Her father, Mitch Winehouse, said at the time she had developed early stage emphysema from smoking cigarettes and crack cocaine.

But the troubled singer was released to perform at celebrations for former South African President Nelson Mandela's 90th birthday in London's Hyde Park and for Britain's Glastonbury music festival.

In addition to her health woes, Winehouse has had several run-ins with police in recent months.

She was investigated by police after a tabloid newspaper published a video that appeared to show her smoking crack cocaine. She was not charged.

Police also cautioned Winehouse in April for assault after she slapped a man during a night out.