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NCI Drug Dictionary

  

barium sulfate 
The sulfate salt of barium, an alkaline, divalent metal. Barium sulfate is quite insoluble in water, and is used as a radiopaque agent to diagnose gastrointestinal medical conditions. Barium sulfate is taken by mouth or given rectally. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)