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There are a lot of videos going around of doctors promoting ivermectin, some were even defending it in the US congress.
For doctors to prescribe it, some countries needs the FDA approval.
In the #Philippines for instance, the FDA only approved the very expensive Remdesivir, which apparently have a very low efficacy. Ivermectin is too cheap so no gains.

The whole thing is that they only want to promote vaccines and overlook all other effective methods of treatment. In India there has been craziness over Remdesivir and Vaccines, as if these are the God sent treatments for Covid, but the fact is that both of them are causing damage, but God knows what's wrong with the whole of the system. In India there has been many effective treatments identified by many small time doctors in the interiors but none of them are getting support or promotion. There is an Ayurvedic pill also introduced Coronil, some of my friends who were down with Covid have consumed it and have found it very effective, but again no boost for alternative treatments.