In addition to the skin, which other area should an antiparasitic drug be noted for treating?

Antiparasitic drugs are primarily designed to target parasitic infections, and among the various systems in the body, the gastrointestinal (GI) tract is particularly significant. Many parasites, such as worms and protozoa, inhabit the GI tract where they feed and reproduce, leading to various gastrointestinal symptoms and complications.

By treating the GI tract, antiparasitic agents effectively eliminate infections caused by intestinal helminths (like roundworms, tapeworms, and flukes) as well as protozoan infections (such as giardiasis and amoebic dysentery). The action of these drugs often involves interfering with the parasite's metabolism or physiology, leading to its death or expulsion from the body through the feces.

While the skin, respiratory tract, urinary tract, and nervous system can sometimes be involved in parasitic infections, the GI tract remains a primary target for many anthelmintic treatments. This is largely due to the prevalence of parasitic infections in the intestines, which is a common pathway for their transmission and persistence in the host. Thus, the emphasis on the GI tract as a critical area for antiparasitic treatment is well-founded in pharmacological practice.