Winehouse's show in Belgrade on Saturday was supposed to be the first stop on a European summer tour. But she was jeered and booed as she stumbled around the stage unable to remember the lyrics to her songs.
The next day, management canceled shows planned for Istanbul and Athens this week.
The rest of the tour -- due to end in Bucharest, Romania, on Aug. 15. -- has now been scrapped.
Winehouse has sought rehab therapy in the past after her widely publicized battles with alcohol and drugs.