Probably not for long given the way things are going and the US Gubmint's complicity in the whole Covidiocy affair.
[cough, cough...ivermectin...cough, cough]
Given the off-label use opposition for ivermectin which is beginning to show positive effects in the treatment of cancers, one will watch the FDA to take some stance shortly.... This will tell much.
Disulfiram, first patented in 1952.
https://www.drugpatentwatch.com/p/generic-api/DISULFIRAM