title: [Letter: Loss of efficacy in long-term nitrites?].
mesh_terms: D004356:Drug Storage; D007548:Isosorbide Dinitrate / Q000008:administration & dosage / Q000494:pharmacology*; D010417:Pentaerythritol Tetranitrate / Q000008:administration & dosage / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D010417:Pentaerythritol Tetranitrate; D007548:Isosorbide Dinitrate
vernacular_title: Wirkungsverlust von Langzeit-Nitriten.