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Efficacy of Ivermectin Treatment on Disease Progression Among Adults With Mild to Moderate COVID-19 and Comorbidities
Question Does adding ivermectin, an inexpensive and widely available antiparasitic drug, to the standard of care reduce the risk of severe disease in patients with COVID-19 and comorbidities?
Findings In this open-label randomized clinical trial of high-risk patients with COVID-19 in Malaysia, a 5-day course of oral ivermectin administered during the first week of illness did not reduce the risk of developing severe disease compared with standard of care alone.
Meaning The study findings do not support the use of ivermectin for patients with COVID-19.
Importance Ivermectin, an inexpensive and widely available antiparasitic drug, is prescribed to treat COVID-19. Evidence-based data to recommend either for or against the use of ivermectin are needed.
Objective To determine the efficacy of ivermectin in preventing progression to severe disease among high-risk patients with COVID-19.
Design, Setting, and Participants The Ivermectin Treatment Efficacy in COVID-19 High-Risk Patients (I-TECH) study was an open-label randomized clinical trial conducted at 20 public hospitals and a COVID-19 quarantine center in Malaysia between May 31 and October 25, 2021. Within the first week of patients’ symptom onset, the study enrolled patients 50 years and older with laboratory-confirmed COVID-19, comorbidities, and mild to moderate disease.
Interventions Patients were randomized in a 1:1 ratio to receive either oral ivermectin, 0.4 mg/kg body weight daily for 5 days, plus standard of care (n = 241) or standard of care alone (n = 249). The standard of care consisted of symptomatic therapy and monitoring for signs of early deterioration based on clinical findings, laboratory test results, and chest imaging.
Main Outcomes and Measures The primary outcome was the proportion of patients who progressed to severe disease, defined as the hypoxic stage requiring supplemental oxygen to maintain pulse oximetry oxygen saturation of 95% or higher. Secondary outcomes of the trial included the rates of mechanical ventilation, intensive care unit admission, 28-day in-hospital mortality, and adverse events.
Results Among 490 patients included in the primary analysis (mean [SD] age, 62.5 [8.7] years; 267 women [54.5%]), 52 of 241 patients (21.6%) in the ivermectin group and 43 of 249 patients (17.3%) in the control group progressed to severe disease (relative risk [RR], 1.25; 95% CI, 0.87-1.80; P = .25). For all prespecified secondary outcomes, there were no significant differences between groups. Mechanical ventilation occurred in 4 (1.7%) vs 10 (4.0%) (RR, 0.41; 95% CI, 0.13-1.30; P = .17), intensive care unit admission in 6 (2.4%) vs 8 (3.2%) (RR, 0.78; 95% CI, 0.27-2.20; P = .79), and 28-day in-hospital death in 3 (1.2%) vs 10 (4.0%) (RR, 0.31; 95% CI, 0.09-1.11; P = .09). The most common adverse event reported was diarrhea (14 [5.8%] in the ivermectin group and 4 [1.6%] in the control group).
Conclusions and Relevance In this randomized clinical trial of high-risk patients with mild to moderate COVID-19, ivermectin treatment during early illness did not prevent progression to severe disease. The study findings do not support the use of ivermectin for patients with COVID-19.
Trial Registration ClinicalTrials.gov Identifier: NCT04920942
Despite the success of COVID-19 vaccines and the implementation of nonpharmaceutical public health measures, there is an enormous global need for effective therapeutics for SARS-CoV-2 infection. At present, repurposed anti-inflammatory drugs (dexamethasone, tocilizumab, and sarilumab),1-3 monoclonal antibodies,4-6 and antivirals (remdesivir, molnupiravir, and nirmatrelvir/ritonavir)7-9 have demonstrated treatment benefits at different stages of COVID-19.10
In Malaysia, about 95% of patients with COVID-19 present early with mild disease, and less than 5% progress to a hypoxic state requiring oxygen supplementation. Notably, patients 50 years and older with comorbidities are at high risk for severe disease.11 Potentially, an antiviral therapy administered during the early viral replication phase could avert the deterioration. Although molnupiravir and nirmatrelvir/ritonavir have shown efficacy in the early treatment of COVID-19,8,9 they can be too expensive for widespread use in resource-limited settings.
Ivermectin, an inexpensive, easy-to-administer, and widely available antiparasitic drug, has been used as an oral therapy for COVID-19. An in vitro study demonstrated inhibitory effects of ivermectin against SARS-CoV-2.12 Although some early clinical studies suggested the potential efficacy of ivermectin in the treatment and prevention of COVID-19,13,14 these studies had methodologic weaknesses.15
In 2021, 2 randomized clinical trials from Colombia16 and Argentina17 found no significant effect of ivermectin on symptom resolution and hospitalization rates for patients with COVID-19. A Cochrane meta-analysis18 also found insufficient evidence to support the use of ivermectin for the treatment or prevention of COVID-19.
These findings notwithstanding, ivermectin is widely prescribed for COVID-19, contrary to the World Health Organization (WHO) recommendation to restrict use of the drug to clinical trials.19 In the present randomized clinical trial, we studied the efficacy of ivermectin for preventing progression to severe disease among high-risk patients with COVID-19 in Malaysia.
The Ivermectin Treatment Efficacy in COVID-19 High-Risk Patients (I-TECH) study was a multicenter, open-label, randomized clinical trial conducted at 20 government hospitals and a COVID-19 quarantine center in Malaysia between May 31 and October 25, 2021. The study was approved by the local Medical Research and Ethics Committee (NMRR-21-155-58433) and registered in ClinicalTrials.gov (NCT04920942). This trial was conducted in accordance with the Declaration of Helsinki and the Malaysian Good Clinical Practice Guideline. All participants provided written informed consent. This study followed the Consolidated Standards of Reporting Trials (CONSORT) reporting guidelines.
In Malaysia, mandatory notification to public health authorities applies to all COVID-19 cases. Patients with mild to moderate disease at risk of disease progression are referred for hospitalization or admitted to a COVID-19 quarantine center to allow close monitoring for 10 or more days from symptom onset and timely intervention in the event of deterioration.
The study enrolled patients with reverse transcriptase–polymerase chain reaction (RT-PCR) test–confirmed or antigen test–confirmed COVID-19 who were 50 years or older with at least 1 comorbidity and presented with mild to moderate illness (Malaysian COVID-19 clinical severity stage 2 or 3; WHO clinical progression scale 2-4)20,21 within 7 days from symptom onset. Patients were excluded if they were asymptomatic, required supplemental oxygen, or had pulse oximetry oxygen saturation (Spo2) level less than 95% at rest. Other exclusion criteria were severe hepatic impairment (alanine transaminase level >10 times of upper normal limit), acute medical or surgical emergency, concomitant viral infection, pregnancy or breastfeeding, warfarin therapy, and history of taking ivermectin or any antiviral drugs with reported activity against COVID-19 (favipiravir, hydroxychloroquine, lopinavir, and remdesivir) within 7 days before enrollment. Eligibility criteria are detailed in the study protocol (Supplement 1). Study investigators collected information on ethnicity based on the patient’s Malaysian identification card or passport (for non-Malaysian citizens).
All patients with COVID-19 were managed in accordance with the national COVID-19 Management Guidelines,20 developed by a local expert panel based on consensus, WHO recommendations, and the US National Institutes of Health guidelines. High-risk patients were defined as those aged 50 years or older with comorbidity. Patients were staged according to clinical severity at presentation and disease progression: stage 1, asymptomatic; stage 2, symptomatic without evidence of pneumonia; stage 3, evidence of pneumonia without hypoxia; stage 4, pneumonia with hypoxia requiring oxygen supplementation; and stage 5, critically ill with multiorgan involvement. Stages 2 and 3 were classified as mild and moderate diseases (WHO scale 2-4), while stages 4 and 5 were referred to as severe diseases (WHO scale 5-9). The standard of care for patients with mild to moderate disease consisted of symptomatic therapy and monitoring for signs of early deterioration based on clinical findings, laboratory test results, and chest imaging.
All study data were recorded in case report form and transcribed into the REDCap (Research Electronic Data Capture) platform.22,23 Patients were randomized in a 1:1 ratio to either the intervention group receiving oral ivermectin (0.4 mg/kg body weight daily for 5 days) plus standard of care or the control group receiving the standard of care alone (Figure). The randomization was based on an investigator-blinded randomization list uploaded to REDCap, which allocated the patients via a central, computer-generated randomization scheme across all study sites during enrollment. The randomization list was generated independently using random permuted block sizes 2 to 6. The randomization was not stratified by site.
The ivermectin dosage for each patient in the intervention arm was calculated to the nearest 6-mg or 12-mg whole tablets (dosing table in the study protocol, Supplement 1). The first dose of ivermectin was administered after randomization on day 1 of enrollment, followed by 4 doses on days 2 through 5. Patients were encouraged to take ivermectin with food or after meals to improve drug absorption. Storage, dispensary, and administration of ivermectin were handled by trained study investigators, pharmacists, and nurses.
The primary outcome was the proportion of patients who progressed to severe COVID-19, defined as the hypoxic stage requiring supplemental oxygen to maintain Spo2 95% or greater (Malaysian COVID-19 clinical severity stages 4 or 5; WHO clinical progression scale 5-9). The Spo2 was measured using a calibrated pulse oximeter per the clinical monitoring protocol.
Secondary outcomes were time of progression to severe disease, 28-day in-hospital all-cause mortality, mechanical ventilation rate, intensive care unit admission, and length of hospital stay after enrollment. Patients were also assessed on day 5 of enrollment for symptom resolution, changes in laboratory test results, and chest radiography findings. Adverse events (AEs) and serious AEs (SAEs) were evaluated and graded according to Common Terminology Criteria for Adverse Events, version 5.0.24 All outcomes were captured from randomization until discharge from study sites or day 28 of enrollment, whichever was earlier.
Subgroup analyses were predetermined according to COVID-19 vaccination status, age, clinical staging, duration of illness at enrollment, and common comorbidities.
Patients’ clinical history, anthropometric measurements, blood samples for complete blood cell count, kidney and liver profiles, C-reactive protein levels, and chest radiography were obtained at baseline. Blood sampling and chest radiography were repeated on day 5 of enrollment. Study investigators followed up patients for all outcome assessments and AEs. All study-related AEs were reviewed by an independent Data and Safety Monitoring Board.
The sample size was calculated based on a superiority trial design and primary outcome measure. The expected rate of primary outcome was 17.5% in the control group, according to previous local data of high-risk patients who presented with mild to moderate disease.11 A 50% reduction of primary outcome, or a 9% rate difference between intervention and control groups, was considered clinically important. This trial required 462 patients to be adequately powered. This sample size provided a level of significance at 5% with 80% power for 2-sided tests. Considering potential dropouts, a total of 500 patients (250 patients for each group) were recruited.
Primary analyses were performed based on the modified intention-to-treat principle, whereby randomized patients in the intervention group who received at least 1 ivermectin dose and all patients in the control group would be followed and evaluated for efficacy and safety. In addition, sensitivity analyses were performed on all eligible randomized patients, including those in the intervention group who did not receive ivermectin (intention-to-treat population).
Descriptive data were expressed as means and SDs unless otherwise stated. Categorical data were analyzed using the Fisher exact test. Continuous variables were tested using the t-test or Mann-Whitney U test. The primary and categorical secondary outcome measures were estimated using relative risk (RR). The absolute difference of means of time of progression to severe disease and lengths of hospitalization between the study groups were determined with a 95% CI. Mixed analysis of variance was used to determine whether the changes of laboratory investigations were the result of interactions between the study groups (between-patients factor) and times (within-patient factor), and P < .05 was considered statistically significant. Statistical analyses were performed using IBM SPSS Statistics for Windows, version 22.0 (IBM Corp).
Interim analyses were conducted on the first 150 and 300 patients, with outcome data retrieved on July 13 and August 30, 2021, respectively. The overall level of significance was maintained at P < .05, calculated according to the O’Brien-Fleming stopping boundaries. Early stopping would be considered if P < .003 for efficacy data. The results were presented to the Data and Safety Monitoring Board, which recommended continuing the study given no signal for early termination.
Between May 31 and October 9, 2021, 500 patients were enrolled and randomized. The last patient completed follow-up on October 25, 2021. Four patients were excluded after randomization. One patient in the control arm was diagnosed with dengue coinfection; in the intervention arm, 2 failed to meet inclusion criteria owing to symptom duration greater than 7 days and negative COVID-19 RT-PCR test result, while 1 had acute coronary syndrome before ivermectin initiation. In addition, 6 patients in the intervention arm withdrew consent before taking a dose of ivermectin. The modified intention-to-treat population for the primary analysis included 490 patients (98% of those enrolled), with 241 in the intervention group and 249 in the control group (Figure). Drug compliance analysis showed that 232 patients (96.3%) in the intervention group completed 5 doses of ivermectin.
Baseline demographics and characteristics of patients were well balanced between groups (Table 1). The mean (SD) age was 62.5 (8.7) years, with 267 women (54.5%); 254 patients (51.8%) were fully vaccinated with 2 doses of COVID-19 vaccines. All major ethnic groups in Malaysia were well represented in the study population. The majority had hypertension (369 [75.3%]), followed by diabetes mellitus (262 [53.5%]), dyslipidemia (184 [37.6%]), and obesity (117 [23.9%]).
The mean (SD) duration of symptoms at enrollment was 5.1 (1.3) days. The most common symptoms were cough (378 [77.1%]), fever (237 [48.4%]), and runny nose (149 [30.4%]). Approximately two-thirds of patients had moderate disease. The average baseline neutrophil-lymphocyte ratio and serum C-reactive protein level were similar between groups. There were no significant differences in the concomitant medications prescribed for both groups. In sensitivity analyses, baseline characteristics were similar in the intention-to-treat population (eTable 1 in Supplement 2).
Créditos: Comité científico Covid