Another compound used that is also a zinc ionophore is Quercetin [1] which quite a few folks here already take for other reasons. It is easier to get online since it does not require a prescription. It also has less side effects than Chloroquine which is a plus in my book. I mention this because you have to be taking it in the first few days or prior to infection to be most effective. Doctors will be treating people that are well beyond the first few days of infection.
[1] - https://www.ncbi.nlm.nih.gov/pubmed/25050823