The invention relates to a water-soluble, linear cyclodextrin copolymer for use as a medicament, the copolymer having a linear polymer backbone, which copolymer includes a plurality of cyclodextrin monomer moieties and linker moieties in the linear polymer backbone, wherein, unless the cyclodextrin monomer moiety or the linker moiety is present at the terminus of a polymer chain, each of the cyclodextrin monomer moieties is attached to two of the linker moieties and each of the linker moieties covalently links two cyclodextrin monomer moieties； and wherein the cyclodextrin monomer moieties are unsubstituted or substituted by groups that do not interfere with the copolymerization with the linker moiety.
