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Ivermectin is a drug approved by the United States Food and Drug Administration (FDA) to treat parasites in animals and in humans with intestinal strongyloidiasis (roundworm) and onchocerciasis (river blindness) orally, as well as ectoparasites and skin conditions topically.  Ivermectin is not approved by the FDA to treat or prevent COVID-19.

Image/Philippines FDA

Nonetheless, prescriptions of ivermectin by U.S. health care providers increased more than tenfold from 3,589 per week pre-COVID-19 to 39,102. In addition, the U.S. National Institutes of Health (NIH), World Health Organization (WHO) and European Medicine Agency (EMA) have all advised against using ivermectin to treat or prevent COVID-19.

In a commentary published in the journal Therapeutic Innovation & Regulatory Scienceresearchers from Florida Atlantic University’s Schmidt College of Medicine and collaborators, urge all health care providers to always prioritize compassion with reliable evidence on efficacy and safety. As such, they recommend a moratorium on prescribing ivermectin to treat or prevent COVID-19, except to provide the necessary evidence in data from large-scale randomized trials.

“The evidence to support ivermectin to treat or prevent COVID-19 includes some basic research and inconsistent clinical observations that contribute to the formulation of a hypothesis of efficacy in COVID-19,” said Scott M. Alter, M.D., M.B.A., co-author, associate research professor and an associate professor of emergency medicine, FAU Schmidt College of Medicine. “Currently, data from peer-reviewed published randomized trials of sufficient size, dose and duration are sparse to reliably test the hypothesis of small-to-moderate benefits on clinically relevant endpoints.”

The researchers caution ivermectin is not a benign drug and has reported side effects that include cutaneous, gastrointestinal and cardiovascular symptoms. Specifically, skin rash, nausea, vomiting, diarrhea, stomach pain, hypotension, dizziness, and seizures have been reported.

“For ivermectin in treatment or prevention of COVID-19, health care providers should reassure all patients that if sufficient evidence were to emerge, then this drug would be considered a therapeutic innovation and regulatory authorities would approve the drug,” said Lisa Clayton, D.O., co-author, associate professor and chair, Department of Emergency Medicine, FAU Schmidt College of Medicine.

The authors note that last year, Merck, the manufacturer of ivermectin, stated that they also believe that the available data do not support the safety and efficacy of the drug beyond the doses and populations indicated in the regulatory agency-approved prescribing information. In addition, last summer, a meta-analysis of 14 trials, concluded that the currently available evidence does not support the prescription of ivermectin for treatment or prevention of COVID-19.

“Doing more good than harm in COVID-19 requires concerted efforts by competent and compassionate health care providers, who are justifiably the most trusted, to communicate with their patients the therapeutic and preventive measures of proven benefit,” said Charles H. Hennekens, M.D., Dr.PH, senior author, first Sir Richard Doll Professor and senior academic advisor, FAU Schmidt College of Medicine. “Most importantly, health care providers must remain cognizant that achieving much higher vaccination rates is essential to prevent, mitigate and control the pandemic, especially in the U.S.”

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Hennekens added, “Among the seven richest countries with a population greater than 10 million, the U.S. has the lowest vaccination rates and highest COVID-19 death rates.”

The authors also say that Americans should be aware that with respect to therapeutic innovations, there is a process for drug development for a specific indication and for that application to receive permission to market the therapeutic or drug for other diseases. In addition, for regulatory science, there is an orderly and unbiased process to achieve regulatory approval.

As a cautionary note, the researchers compare similarities in prescriptions of ivermectin to hydroxychloroquine, whose emergency use authorization was withdrawn by the FDA following the results of large-scale trials that demonstrated a lack of efficacy and possible harm for the treatment and prevention of COVID-19.

“At present, there are remarkably efficacious and safe preventive measures, especially vaccinations as well as several therapeutic innovations of proven benefit,” said Hennekens. “It would be unfortunate and create avoidable morbidity and mortality if health care providers were to prescribe a drug of unproven benefit and safety for COVID-19, such as ivermectin, to patients as an alternative to therapeutic innovations of proven benefit in treatment or, even more importantly, vaccinations to prevent COVID-19.”

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