I actually dont know why so many people are completely hung up on ivermectin, as if it is the big, secret answer to the pandemic.
As Rocketmans list points out, there are a lot of different drugs being used to treat the symptoms of covid, no one is stopping them from being used, whether they work or not. If a treatment is available to a doctor, Im sure they will try it.
Maybe- just maybe, researchers were prioritising an actual vaccine- NOT merely treatments, and that is why research into other drugs- like ivermectin was secondary to getting a working vaccine.
Now, after months and months, there is anecdotal evidence that some of these drugs may help, but you have to take off your conspiracy hat for a few minutes and read the data for what it is.
For example, the information I've read about ivermectin being effectively used in Brazil is at best anecdotal for now. Some doctors say it helped for some and not for others. There are many factors when it comes to mortality, but If their death toll is an indicator, I would probably prefer the vaccine.