CLATHRATE COMPLEX OF CYCLODEXTRIN OR ARABINOGALACTAN WITH 9-PHENYL-SYM-OCTAHYDROSELENOXANTHENE

The invention relates to novel clathrate complexes of cyclodextrin or arabinogalactan with 9-phenyl-sym-octahydroselenoxanthene, possibly in ±-crystalline form, with a mass ratio of 9-phenyl-sym-octahydroselenoxanthene:cyclodextrin of from 1:3 to 1:30 or 9-phenyl-sym-octahydroselenoxanthene:arabinogalactan of from 1:10 to 1:20. The clathrate complex may be in crystalline form, possibly in the form of nano-particles with a size of less than 100 nm. In the clathrate complex, cyclodextrin is selected from ±-, ²-, ³- or hydroxypropyl-²-cyclodextrin, primarily ²-cyclodextrin. The proposed clathrate complexes make it possible to increase the water-solubility of the active compound, to improve the bioavailability, to reduce the dosage of the drug and, consequently, to reduce the toxic effect of 9-phenyl-sym-octahydroselenoxanthene. The complexes exhibit cytoradioprotective activity. The invention also relates to a liquid-phase and solid-phase methods for producing clathrate complexes, as well as to pharmaceutical compositions and drugs thereof.