<prompt> All the drugs are used in the treatment of Giardiasis except:NitazoxanideMetronidazoleTinidazoleDiloxanide furoate  <response>: Treatment options for Giardiasis:metronidazole 250 mg tds for 5 daystinidazole 2 g once by mouthnitazoxanide 500 mg bd for 3 daysparomomycin, an oral aminoglycosideDiloxanide furoate is a lumenal amebicideref:Harrisons 18e p1731, 17e p1313 