A fully extendable telescopic drawer guide for furniture components that can be extended from the body of an item of furniture, with a guide rail facing the body, a running rail associated with the extendable furniture component, and an intermediate rail arranged between these two rails. Rolling elements are provided which are supported in cages and transfer the load of the extendable furniture component by way of rolling surfaces disposed on the rails. At least one rotatably supported supporting roller for the running rail is provided on the front end of the intermediate rail. The intermediate rail is implemented as a profile rail which encompasses the region of the guide rail provided with the rolling surfaces and which has on the bottom side an elongated opening for insertion of the support region of the guide rail to be secured to the body wall of an associated item of furniture.