Research Area: Infection Biological Activity: Praziquantel(Biltricide, Droncit) is an anthelmintic effective against flatworms. It increases the permeability of the membranes of schistosome cells towards calcium ions. The drug, thereby induces contraction of the parasites, resulting in paralysis in the contracted state. The dying parasites are dislodged from their site of action in the host organism and may enter systemic circulation or may be destroyed by host immune reaction (phagocytosis). Additional mechanisms including focal disintegrations and disturbances of oviposition (laying of eggs) are seen in other types of sensitive parasites. [1]