 "Rehab" started at number 18 in the Dutch Top 40 on January 17, 2009, and peaked at number 3 in its fourth week on the chart.In Norway it entered the singles chart at number 19 and climbed to number 4, becoming Rihanna's seventh top-five single in that country.It peaked at number 8 on the Slovakian singles chart, becoming Rihanna's fifth international top-ten single, and her sixth top-ten single in Slovakia.