Anthelminthic Agents

Anthelmintic agents are drugs that eliminate parasitic helminths, often targeting adult forms, though some affect larval or egg stages.

For example, pyrazinoisoquinoline drugs, such as praziquantel, target the protective tegumental cells of the parasite.

Praziquantel enters these cells and triggers a rapid influx of calcium ions through ion channels.

The sudden calcium entry results in sustained muscle contraction. Eventually, the parasite becomes paralyzed in the contracted state.

This disruption makes the tegument porous, exposing inner surfaces and internal antigens to the host immune system.

These morphological changes weaken the parasite's defenses, making it more susceptible to immune attack.

As a result, immune modulators, such as antibodies, can act on the exposed parasite antigens, enhancing host immune recognition.

This immune response acts synergistically with praziquantel, accelerating the clearance of the parasite.