Which drug is considered a broad-spectrum anthelmintic?

Albendazole is classified as a broad-spectrum anthelmintic due to its effectiveness against a wide range of helminth infections, including both nematodes (roundworms) and cestodes (tapeworms). Its mechanism of action involves the inhibition of microtubule synthesis, which disrupts the parasite's ability to maintain essential cellular structures and processes, ultimately leading to their death.

In clinical practice, Albendazole is used to treat various conditions such as neurocysticercosis and other infections caused by multiple types of worms. This broad spectrum of activity is a key factor in its designation as a broad-spectrum agent, as it is capable of addressing multiple types of parasitic infections with a single medication.

The other drugs listed exhibit more narrow-spectrum coverage or target specific groups of parasites. For instance, Pyrantel Pamoate primarily targets intestinal nematodes like pinworms and roundworms but has limited activity against other types. Levamisole specifically acts on certain nematodes and is often used as a dewormer but is not effective against all helminths. Niclosamide is mainly effective against cestodes and does not cover nematodes, making it less broad in its spectrum of action.