Ipratropium bromide nasal spray 0.03% provides additional relief from rhinorrhea when combined with terfenadine in perennial rhinitis patients; a randomized, double-blind, active-controlled trial.
Finn AF Jr, Aaronson D, Korenblat P, Lumry W, Settipane G, Spector S, Woehler T, Drda K, Wood CC. Am J Rhinol. 1998 Nov-Dec; 12(6):441-9.