SINGER Amy Winehouse is in hospital again after reacting badly to medication, a spokesman said overnight.

The 25-year-old Grammy winner was admitted to a clinic after falling ill on Sunday and has been kept there for tests.

Winehouse was taken to hospital for a similar complaint in July.

The singer is best known for her breakthrough album Back to Black and landed five Grammy awards earlier in the year, but her career has been overshadowed by a battle against drug addiction and bouts of illness.

Her husband, Blake Fielder-Civil, was released on parole last month after spending around a year in prison, on condition he checked into a drug rehabilitation center.