Drug groups [BR:br08330] Gastrointestinal agent DG01559 5-HT4-receptor antagonist D05471 Piboserod hydrochloride Target-based classification of drugs [BR:br08310] G Protein-coupled receptors Rhodopsin family Serotonin HTR4 [HSA:3360] [KO:K04160] D05471 Piboserod hydrochloride (USAN)