some other suitable molecule or the drug may be transferred to the matrix for which it has the highest affinity importantly since no covalent bonds are formed or broken during the drug cyclodextrin complex formation the complexes are in dynamic equilibrium with free drug and cyclodextrin molecules in solution the complexes are usually prepared by addition of an excess amount of the drug to an aqueous cyclodextrin solution the suspension formed is and then filtered or centrifuged to form a clear drug cyclodextrin complex solution useful cyclodextrins for use in the present invention non exclusively include alkyl cyclodextrins hydroxy alkyl cyclodextrin such as hydroxy propyl u03b2 cyclodextrin carboxy alkyl cyclodextrins and sulfoalkyl ether cyclodextrin such as sulfo butyl ether u03b2 cyclodextrin examples of suitable cyclodextrins for use in the present invention non exclusively include u03b1 cyclodextrin u03b2 cyclodextrin u03b3 cyclodextrin methyl u03b1 cyclodextrin methyl u03b2 cyclodextrin methyl u03b3 cyclodextrin ethyl u03b2 cyclodextrin butyl u03b1 cyclodextrin butyl u03b2 cyclodextrin butyl u03b3 cyclodextrin pentyl u03b3 cyclodextrin hydroxyethyl u03b2 cyclodextrin hydroxyethyl u03b3 cyclodextrin 2 hydroxypropyl u03b1 cyclodextrin 2 hydroxypropyl u03b2 cyclodextrin 2 hydroxypropyl u03b3 cyclodextrin 2 hydroxybutyl u03b2 cyclodextrin acetyl u03b1 cyclodextrin acetyl u03b2 cyclodextrin acetyl u03b3 cyclodextrin propionyl u03b2 cyclodextrin butyryl u03b2 cyclodextrin succinyl u03b1 cyclodextrin succinyl u03b2 cyclodextrin succinyl u03b3 cyclodextrin benzoyl u03b2 cyclodextrin palmityl u03b2 cyclodextrin toluenesulfonyl u03b2 cyclodextrin acetyl methyl u03b2 cyclodextrin acetyl butyl u03b2 cyclodextrin glucosyl u03b1 cyclodextrin glucosyl u03b2 cyclodextrin glucosyl u03b3 cyclodextrin maltosyl u03b1 cyclodextrin maltosyl u03b2 cyclodextrin maltosyl u03b3 cyclodextrin u03b1 cyclodextrin carboxymethylether u03b2 cyclodextrin carboxymethylether u03b3 cyclodextrin carboxymethylether carboxymethylethyl u03b2 cyclodextrin phosphate ester u03b1 cyclodextrin phosphate ester u03b2 cyclodextrin phosphate ester u03b3 cyclodextrin 3 trimethylammonium 2 hydroxypropyl u03b2 cyclodextrin sulfobutyl ether u03b2 cyclodextrin carboxymethyl u03b1 cyclodextrin carboxymethyl u03b2 cyclodextrin carboxymethyl u03b3 cyclodextrin and combinations.