“ Capsaicin induced dose-dependent relaxation responses in carbachol-…,060) [neurokinin 1 (NK1) receptor antagonist], indomethacin [cyclooxygenase (COX) inhibitor], and the combination of 6-isopropoxy-9-oxoxanthene-2-carboxylic acid (AH6809) and 7-[…), activation of epithelial NK1 receptors, and production of COX products capable of activating relaxant EP2/EP4 receptors.”