What drug regimens are commonly used for nematode infections such as Ascaris, hookworms, and whipworm?

• A. Praziquantel monotherapy
• B. Metronidazole regimens
• C. Ivermectin monotherapy
• D. Albendazole or mebendazole; combination therapy may be used in some settings.

Answer: (D)

The main idea is that the standard treatment for common intestinal nematodes like Ascaris, hookworms, and whipworm is a benzimidazole class drug given as albendazole or mebendazole. These medications work by inhibiting the parasite’s ability to form and function with its microtubules, which interferes with glucose uptake and ultimately starves and kills the worms. They are effective against both the adult worms and, in many cases, developing larvae, and they’re favored because they’re widely available, affordable, and easy to dose.

In some settings, combination therapy may be used to boost cure rates in areas with heavy polyparasitism or where resistance concerns exist, pairing an agent like albendazole with another antiparasitic. However, the core regimen for addressing Ascaris, hookworms, and whipworm remains albendazole or mebendazole.

Praziquantel is primarily used for cestodes and schistosomes, not the common intestinal nematodes listed. Metronidazole targets protozoa and anaerobic bacteria, not nematodes. Ivermectin has efficacy against several nematodes, but for these particular intestinal parasites, albendazole or mebendazole are the standard, with combination strategies reserved for specific contexts.