(+) -Norfenfluramine

(+) -Norfenfluramine, the principal hepatic metabolite of (+) -fenfluramine, acts as a selective agonist for the 5-HT2B receptor, exhibiting a potent K i of 11.2 nM. It significantly promotes the hydrolysis of inositol phosphates and heightens intracellular Ca2+ levels. This compound is valuable in the study of primary pulmonary hypertension and valvular heart disease.