Research Evidence / Overview of Studies for Ivermectin
Evidence for use in COVID-19
Research has evaluated ivermectin for use in individuals with COVID-19. Studies include randomized controlled trials (RCTs) and observational settings. These studies monitored outcomes related to severe events, such as mortality and the need for mechanical ventilation, and also used in research exploring how symptoms change over time, including viral clearance. The populations included both non-hospitalized individuals with milder disease and patients who were hospitalized with more severe illness.
The findings describe patterns observed in the studies but have been mixed and highly heterogeneous. Some trials reported how symptoms evolved in the observed populations, with findings describing patterns of difference in the time to recovery compared to control groups. However, the overall body of evidence often data show patterns related to significant variability due to differences in study design, specific doses used, and the timing of administration. Overall, evidence is limited by the quality and consistency of the available research.
Evidence for use in Scabies
Ivermectin was studied for scabies, which are conditions where symptoms may vary in intensity. The research primarily includes randomized controlled trials comparing administration to traditional topical treatments. These studies examined outcomes related to clinical cure and also monitored the absence of mites (parasitological cure) and the occurrence of outcomes related to physical discomfort. Research included people with both classic scabies and the more severe crusted scabies.
Findings describe patterns observed in the studies included measurements of cure rates following administration, especially in non-crusted forms of the condition. The research also helps to contextualize that for some individuals, especially those with crusted scabies, follow-up was observed in some studies to include more than one administration to maintain measured mite clearance. Adverse events was observed in some studies to be generally transient and of low frequency.
Evidence for use in Onchocerciasis (River Blindness)
Ivermectin was evaluated in community-based public health programs for onchocerciasis, a parasitic infection often affecting the eyes. Research has taken the form of large-scale community trials and observational settings. Studies research examined outcomes related to the reduction of parasitic load in the skin and the impact on serious eye-related outcomes reflecting daily functioning or activity level.
Findings describe patterns observed in the studies where a reduction in the number of parasites in the skin was associated with repeated administration. Studies report how symptoms evolved in the observed populations in these communities, data show patterns related to a subsequent change in measurements of some of the severe eye manifestations associated with the condition. Reactions that was associated with the rapid reduction of parasites, known as the Mazzotti reaction, was observed in some studies, and its frequency can be related to the initial burden of infection.
Evidence for use in Strongyloidiasis
Research explored Strongyloides stercoralis infection. The available research includes randomized controlled trials. The primary goal was to examine whether parasitological cure (eliminating the parasite from the body) was associated with administration. These studies primarily focused on individuals with chronic, uncomplicated infections.
Findings describe patterns observed in the studies where administration was associated with measurements of parasitological cure rates. Adverse events was observed in some studies to be generally transient and of low frequency.
What is still uncertain about Ivermectin research
For COVID-19, certainty remains low due to high variability and mixed findings describe patterns observed in the studies across different trials. Comparative evidence is lacking in a standardized manner for certain administration plans or regimens across indications. Overall, evidence quality varies across studies, meaning that some research is stronger and more reliable than others. It is important to remember that findings describe group patterns, not personal outcomes, and research does not determine whether an individual will respond similarly.