Antihelminthic drugs that is effective against blood fluke ,liver fluke, lung fluke and cysticercus is
**Core Concept**
Antihelminthic drugs target various parasites, including blood flukes (Schistosoma spp.), liver flukes (Fasciola spp.), lung flukes (Paragonimus spp.), and cysticerci (Taenia solium). Effective antihelminthic agents must have a broad spectrum of activity against these parasites.
**Why the Correct Answer is Right**
Praziquantel is a broad-spectrum antihelminthic drug effective against a wide range of parasites, including blood flukes (Schistosoma spp.), liver flukes (Fasciola spp.), lung flukes (Paragonimus spp.), and cysticerci (Taenia solium). Its mechanism of action involves binding to calmodulin, disrupting microtubule function, and ultimately causing parasite death. Praziquantel is also effective against other parasites, such as Echinostoma and Hymenolepis spp.
**Why Each Wrong Option is Incorrect**
**Option A:** Albendazole is primarily used against nematodes (roundworms) and some cestodes (tapeworms), but it is not effective against blood flukes, liver flukes, or lung flukes.
**Option B:** Mebendazole is another antinematodal agent, but it is not effective against blood flukes, liver flukes, or lung flukes.
**Option C:** Ivermectin is primarily used against nematodes (roundworms) and some ectoparasites, but it is not effective against blood flukes, liver flukes, or lung flukes.
**Clinical Pearl / High-Yield Fact**
Praziquantel is the drug of choice for treating schistosomiasis (blood fluke infection) and is also used to treat hydatid disease (Echinococcus spp.) and other fluke infections.
**Correct Answer: C. Praziquantel**