HRH3 and amnesia: Ciproxifan (cyclopropyl 4‐(3‐(1H‐imidazol‐4‐yl)propyloxy) phenyl ketone) is an extremely potent histamine H3 receptor (H3R) inverse agonist/antagonist which enhanced the release of histamine and increases sustained attention and alertness states.4, 5, 6 Both thioperamide (a potent HRH3 antagonist) and ciproxifan enhance working memory4, 7, 8, 9, 10 and long‐term memory11, 12, 13, 14, 15, 16, 17 and counteract scopolamine‐induced amnesia.11, 12, 18, 19, 20, 21