This product is issued by the European Pharmacopeia and it is intended for use as an analytical standard. The half-life is not determined by the supplier Please view the leaflet provided by the European Pharmacopeia: https://crs.edqm.eu/db/4DCGI/leaflet?leaflet=T1405000_2.pdf.
DrugBank is listing a half-life of 2.9 - 3.6 hours for Tiapride. See the link below for additional information: https://go.drugbank.com/drugs/DB13025