In Agile, you are supposed to ship product on a regular cadence. All features are added to a product backlog, divided into small projects that fit within a sprint, and then prioritized. The backlog is just a way to keep track of all of the ideas people have, requests from customers, major bugs and other things.
The first patent for Pristiq is set to expire in February 2022. This is the earliest predictable date that a generic version of the drug could become available. However, other circumstances could come up to extend or shorten the exclusivity period.
You should not buy any generic Benicar until there is an approved generic version available. The first patent for Benicar currently expires in October 2016. This is the earliest date that a generic version of Benicar could become available. However, other circumstances could cause the exclusivity period to extend beyond 2016. This could include such things as other patents for specific Benicar uses or lawsuits.