The key issue here is the distinction between *potential* and *proven* efficacy. While some early studies and meta-analyses, such as the one in *PLOS ONE*, suggested possible antiviral effects of ivermectin in vitro or in small trials, these findings have not been replicated in large, high-quality randomized controlled trials (RCTs). The lack of consistent, robust evidence across multiple studies means that the *potential* benefit remains unproven. Regulatory agencies like the FDA and WHO require strong, reproducible evidence before endorsing a treatment, and ivermectin has not met that standard for COVID-19. It is important to note that the *PLOS ONE* meta-analysis you referenced was criticized for methodological limitations, including potential biases and incomplete data, which undermines its reliability.
Furthermore, the claim that "big pharma is hiding it" relies on a speculative and unsubstantiated narrative. There is no credible evidence to suggest that pharmaceutical companies are actively suppressing data on ivermectin’s effectiveness for COVID-19. In fact, many studies on ivermectin have been conducted independently, and the drug has been used in various countries as part of public health strategies. However, these uses have not been supported by the rigorous clinical trials required to establish efficacy. It is crucial to distinguish between anecdotal or preliminary findings and the scientific consensus. Until there is clear, high-quality evidence, the claim that ivermectin is effective against COVID-19 remains unverified.