Which anthelmintic is effective against both roundworms and tapeworms?

Albendazole is an effective anthelmintic agent used to treat various parasitic infections, specifically targeting both roundworms and tapeworms. Its mechanism of action involves the inhibition of microtubule synthesis in the parasites, which leads to their inability to absorb glucose and results in their eventual death. This broad spectrum of activity makes albendazole a first-line treatment option for infections caused by a range of helminths, including Ascaris lumbricoides (a roundworm) and Taenia species (tapeworms).

In contrast, the other options, while effective against specific types of worms, do not possess the same breadth of action. Pyrantel pamoate is mainly effective against roundworms but does not effectively treat tapeworm infections. Mebendazole is similar in that it is primarily used for various nematodes (roundworms) but has limited efficacy against tapeworms. Ivermectin is primarily effective against certain ectoparasites and some nematodes but is not typically used for treating tapeworm infections. Therefore, albendazole stands out as the preferred choice due to its comprehensive effectiveness against both groups of parasites.