Antiparasitic

Antiparasitic Agents

Hookworms, a common parasitic infection.

Antiparasitic agents are a class of medications used to treat infections caused by parasites. These agents are crucial in the management of diseases caused by various types of parasites, including protozoa, helminths, and ectoparasites. The development and use of antiparasitic drugs have significantly improved the control of parasitic diseases worldwide.

Types of Parasites

Parasites are organisms that live on or inside a host organism and derive nutrients at the host's expense. They can be broadly classified into three main categories:

• Protozoa: Single-celled organisms that can cause diseases such as malaria, amoebiasis, and giardiasis.
• Helminths: Multicellular worms, including roundworms, tapeworms, and flukes, that can cause infections such as schistosomiasis and hookworm disease.
• Ectoparasites: Parasites such as lice and mites that live on the surface of the host.

Mechanism of Action

Antiparasitic agents work through various mechanisms to eliminate parasites from the host. These mechanisms include:

• Inhibition of metabolic pathways: Some antiparasitic drugs interfere with the metabolic processes of the parasite, leading to its death.
• Disruption of cell membranes: Certain agents disrupt the cell membranes of parasites, causing cell lysis and death.
• Inhibition of protein synthesis: By targeting the protein synthesis machinery of the parasite, these drugs prevent the parasite from growing and reproducing.

Common Antiparasitic Drugs

Several antiparasitic drugs are commonly used in clinical practice:

• Albendazole: Used to treat a variety of helminth infections, including hookworm and roundworm infections.
• Ivermectin: Effective against a range of parasites, including lice, scabies, and certain nematodes.
• Metronidazole: Commonly used to treat protozoal infections such as amoebiasis and giardiasis.

Hookworm Infection

Hookworms under a microscope.

Hookworm infection is a type of helminthiasis caused by nematodes of the family Ancylostomatidae. The most common species that infect humans are Ancylostoma duodenale and Necator americanus. These parasites are transmitted through contact with contaminated soil, often in areas with poor sanitation.

Symptoms of hookworm infection include abdominal pain, diarrhea, and anemia due to blood loss. Treatment typically involves the use of antiparasitic drugs such as albendazole or mebendazole.

Related Pages

• Parasitic disease
• Helminthiasis
• Protozoal infection
• Ectoparasitic infestation

Classification
External resources