Subkutant afgivelsessystem, fremgangsmåde til fremstilling deraf og anvendelse deraf til behandling af cholinerge mangellidelser

The present invention relates to a drug delivery system comprising a biodegradable polymeric matrix and at least one of the pharmacologically active substances of general formula (I): wherein A represents a residue of general formula (II): wherein each of X 1 to X 5 represents, independently, an hydrogen atom, a linear or branched C 1 to C 6 alkyl group, a linear or branched C 1 to C 6 alkyloxy group, a hydroxyl group -OH, an amino group -NH 2 , a primary or secondary C 1 to C 6 alkylamino group, a halogen atom, a nitro group -NO 2 ; said substance being embedded into said matrix. It relates also to a process for its preparation and to its use for the preparation of a medicament.