A medical cushion (1), in particular an anti-decubitus cushion, is in particular multicellular and is distinguished in that the cushion is equipped, at least in the area where skin contact (6) occurs, with an active membrane (3) based on a skin-compatible matrix (4) into which a molecular sieve is mixed. This molecular sieve is charged with at least one active substance (Z, Z₁, Z₂), and the molecular sieve/active substance adduct (5) releases the active substance when the active membrane comes into skin contact (6) in conjunction with the transpiration of the skin.