As many Republican politicians, including some running for office in Arizona, sow doubt about health experts and promote debunked COVID-19 cures, scientists continue to spend time and effort confirming they still don’t work. New research offers the latest on ivermectin.

New research in the journal JAMA offers the latest on ivermectin.

The antiparasitic drug was one of a number of pills experts once considered repurposing to fill the gap in COVID-19 treatments.

But evidence for its effectiveness was scant and controversial, based mainly on small, in-patient studies and retracted papers.

Subsequent, larger studies across various levels of disease severity showed no clinical benefit.

The new double-blinded, randomized clinical trial of almost 1,600 outpatients with delta or omicron variants is no different: In mild to moderate cases of COVID-19, ivermectin did not perform better than a placebo.