title: Guanethidine-resistant hypertension.
mesh_terms: D002986:Clinical Trials as Topic; D004357:Drug Synergism; D006145:Guanethidine / Q000627:therapeutic use*; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*; D007275:Injections, Intravenous; D009638:Norepinephrine / Q000494:pharmacology; D010643:Phenoxybenzamine / Q000494:pharmacology*; D010919:Placebos; D013564:Sympathetic Nervous System / Q000187:drug effects; D014636:Valsalva Maneuver
chemical_list: D010919:Placebos; D010643:Phenoxybenzamine; D009638:Norepinephrine; D006145:Guanethidine