Is there any evidence that ivermectin suppresses the PSA level in prostate cancer?  

I had two prostate cancer patients recently take ivermectin against medical advice. Both of them had their PSA drop by 2-3 ng/ml. Are you seeing this in practice? Patients taking ivermectin on their own and then their PSA's drop? Of course, there is concern about toxicity of ivermectin, especially liver toxicity.