Diphenylpyraline, a histamine H1 receptor antagonist, has psychostimulant properties.
Lapa GB, Mathews TA, Harp J, Budygin EA, Jones SR. Diphenylpyraline, a histamine H1 receptor antagonist, has psychostimulant properties. Eur J Pharmacol. 2005 Jan 04; 506(3):237-40.