title: Letter: Drug bioavailability.
mesh_terms: D001682:Biological Availability; D001702:Biopharmaceutics; D004077:Digoxin; D010653:Phenylbutazone; D010672:Phenytoin; D014859:Warfarin
chemical_list: D014859:Warfarin; D010672:Phenytoin; D004077:Digoxin; D010653:Phenylbutazone