The medical community stick together in available treatments and release information when something is found and works.
There were certain drugs that were first identified to help with Covid but after more analysis and testing they were found to be unhelpful.
Some more information ....
The available scientific evidence does not support the use of ivermectin, an antiparastic drug, for the treatment or prevention of COVID-19 outside the context of clinical trials, according to a new report from Cochrane, an international organization that reviews medical research and provides guidance about clinical practice.
Ivermectin has been the subject of much misinformation during the pandemic, prompting multiple health organizations and one of the drug’s manufacturers to issue warnings throughout the past year that there is not sufficient evidence to recommend its use for COVID-19 beyond a trial setting