LONDON (AFP) - Troubled British soul singer Amy Winehouse was admitted to a hospital over the weekend because of a bad reaction to medication, her spokeswoman said Tuesday. The news comes a day after her husband Blake Fielder-Civil lost his appeal against a jail sentence for a vicious attack on a pub landlord and a subsequent attempt to cover it up. Winehouse, 25, had "a bad reaction to the combination of medication she has currently been prescribed," said a spokeswoman for the Grammy Award-winning artist, who was admitted to a private London clinic on Sunday. "Amy is on a drug replacement programme and has had bad reactions to her medication before," a friend told the Daily Mirror tabloid. Winehouse, who is fighting drug and alcohol problems, has suffered a string of health scares since apparently being caught smoking crack cocaine in footage released by The Sun newspaper in January.