Which of the following parasitic infections is most effectively treated with ivermectin?

INI-CET EXAM -2025

Pharmacology

Easy

Appeared in: INI-CET EXAM -2025

Explanation

Ivermectin is the first-line agent and drug of choice for treating onchocerciasis, caused by Onchocerca volvulus. It effectively kills the microfilariae, preventing the progression to blindness and severe skin disease.
For lymphatic filariasis, caused by Wuchereria bancrofti, ivermectin is a key component of mass drug administration (MDA) programs, often combined with albendazole. This strategy effectively clears microfilariae from the bloodstream, interrupting disease transmission on a community-wide scale.
This combination represents two of the most significant filarial diseases for which ivermectin is a primary, highly effective, and widely utilized therapeutic agent in global public health.

Option A: While ivermectin is the drug of choice for Strongyloides stercoralis, it is not the primary treatment for Trichinella spiralis. Trichinellosis is typically treated with albendazole or mebendazole.
Option B: Ivermectin use in patients with Loa loa can be dangerous, especially in those with high microfilarial loads, as it can precipitate severe adverse reactions, including fatal encephalopathy. Diethylcarbamazine (DEC) is often the preferred agent for loiasis, administered cautiously.
Option C: This option is incorrect due to the inclusion of Loa loa. Although ivermectin is the drug of choice for Onchocerca volvulus, its co-administration in areas endemic for Loa loa requires extreme caution and screening due to the risk of severe encephalopathy in co-infected individuals with high Loa loa microfilaremia.

Visual 1: Chart: A table listing common helminth parasites (e.g., O. volvulus, W. bancrofti, Ascaris, Trichuris), their associated diseases, and the first-line and alternative drug treatments for each.
Visual 2: Infographic: A diagram illustrating the mechanism of action of ivermectin on nematode nerve and muscle cells, leading to paralysis and death of the parasite.
Visual 3: Map: A world map showing the endemic regions for onchocerciasis and lymphatic filariasis, highlighting the areas where mass drug administration with ivermectin is prevalent.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacotherapy for Helminthic Infections as background academic context rather than a clinical decision trigger.
A key nursing role in global health settings is participating in Mass Drug Administration (MDA) programs. Understanding that ivermectin is central to controlling onchocerciasis and lymphatic filariasis is crucial.
Patient safety is paramount. Before administering ivermectin in regions where Loa loa is also present, it is critical to assess for co-infection. A history of eye worm or Calabar swellings, or laboratory screening, is necessary to prevent potentially fatal encephalopathy.
What if? If a patient from a Loa loa endemic area presents with symptoms of onchocerciasis and has a very high Loa loa microfilarial count (greater than 30,000/mL), ivermectin is contraindicated. The treatment strategy would shift to using albendazole or apheresis to first reduce the Loa loa burden before cautiously considering any microfilaricidal drugs.

How to Approach the Question

First, identify the core of the question: it asks for the parasitic infections most effectively treated with ivermectin.
Recall or look up the primary indications for ivermectin. You should remember it's a key drug for onchocerciasis ('river blindness') and strongyloidiasis.
Evaluate each option pair:
Option A: Strongyloides is correct, but is ivermectin primary for Trichinella? (No, that's albendazole/mebendazole).
Option B & C: Both include Loa loa. Recall if there are any special considerations for ivermectin and Loa loa. (Yes, a major risk of encephalopathy in heavy infections). This makes it a less 'effective' and more 'risky' choice.
Option D: Includes Onchocerca volvulus (a primary indication) and Wuchereria bancrofti (a major use in global health programs). This pair represents two major diseases where ivermectin is a cornerstone of therapy.

Concept Tested & Keywords

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