The incident occurred Monday in the Modern Sultan Hotel in Istanbul's Faith district, the newspaper Today's Zaman reported.
Two of the victims were hotel employees, the rest foreign tourists, the newspaper said, adding they were taken to five different hospitals.
Witnesses described several of the victims as unconscious, with white foam emerging from their mouths.
Britney Spears debuts 'Perfume' video
Couple calls 9-1-1 over missing hash browns; assault McDonanld's employees