There may be many reasons why Qixi grapefruit flavor is not available. First of all, it may be that Qixi Company encountered production problems and was unable to continue producing this flavor. Secondly, it may be due to the adjustment of market strategy of 7-Up Company that it decided to stop producing drinks with this flavor. Finally, it may be that there is a problem with 7-up's supply chain management and it is unable to continue to supply drinks with this flavor.

No matter what the reason is, the 7-up grapefruit-flavored drink may not be available. If you particularly like this flavor, try looking elsewhere or through other channels.