(R)-Praziquantel D11 is the deuterium labeled (R)-Praziquantel. (R)-Praziquantel is the active enantiomer of Praziquantel, is a partial the human 5-HT2B receptor agonist

(R)-Praziquantel modulation of serotoninergic signaling occurs over a concentration range sufficient to regulate vascular tone of the mesenteric blood vessels where the adult parasites reside within their host. The important anthelmintic is supported by a broad, cross species polypharmacology with (R)-Praziquantel modulating signaling events in both host and parasite.