A judge ruled Monday that an Ohio hospital cannot be forced to give a patient ivermectin for Covid-19, reversing an earlier decision that ordered it to administer a parasite medication that has not been approved to treat the disease.

In an 11-page decision, Hamilton County Common Pleas Judge Michael Oster Jr. wrote that there “was no doubt that the medical and scientific communities do not support the use of ivermectin as a treatment for Covid-19.”

Based on the current evidence, Oster wrote, the drug — which is primarily used to deworm horses but has been promoted by some doctorssome Republicans and the popular podcast host Joe Rogan to combat the coronavirus — “is not an effective treatment for Covid-19.”

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