*2.1. Materials*

Pristine racemic PZQ drug was purchased from Sigma Aldrich (St. Louis, MO, USA). Purified pharmaceutical degree. Montmorillonite (Veegum HS®, VHS, Norwalk, CT, USA) was purchased from Vanderbilt Company (Norwalk, CT, USA). The Sepiolite samples from Vicálvaro (Madrid) (SEP) were kindly gifted by TOLSA (Madrid, Spain). Ethanol of 99% (*v*/*v*) of purity, acetonitrile, and dichloromethane were used as solvents.
