Iferanserin (S-MPEC) is a selective 5-HT receptor (serotonin receptor) antagonist with an affinity for 5-HT2A receptor. Iferanserin has the potential for internal hemorrhoid disease treatment[1].
An intra-anal ointment application of Iferanserin might modify the vascular effects occurring in hemorrhoid disease and thereby reduce or eliminate the most frequently occurring symptoms of hemorrhoid disease[1].
[1]. Herold A, et al. Intra-anal Iferanserin 10 mg BID for hemorrhoid disease: a prospective, randomized, double-blind, placebo-controlled trial. Clin Ther. 2012 Feb;34(2):329-40.