A telescopic lifting assembly designed particularly for the hydraulic height adjustment of a medical treatment table includes two antiparallel juxtaposed linear drives (2, 3) connected functionally one behind the other in the direction of actuation (1) whereby the inner components (6) are connected to a coupling piece (7) which is provided with guide surfaces (14) cooperating with the outer components (5) in the direction of actuation (1). A secure and stable guiding mechanism is made possible thereby along the entire lifting range.