title: Letter: Dosage interval of drugs with narrow therapeutic ranges.
mesh_terms: D004358:Drug Therapy; D006207:Half-Life; D006801:Humans; D004364:Pharmaceutical Preparations / Q000008:administration & dosage*; D010672:Phenytoin / Q000008:administration & dosage
chemical_list: D004364:Pharmaceutical Preparations; D010672:Phenytoin