Daily Star's biggest headlines straight to your inbox!A bizarre warning has been issued to Covid-19 patients after some of them turned to a horse dewormer as a makeshift treatment at home that has no scientific value.Doctors are concerned over people using horse deworming drug Ivermectin following a number requiring urgent treatment due to overdosing in the US.Dr Jason McElyea has issued the warning after the number of overdoses from using the drug has added further strain on emergency units in Oklahoma.Although the medication can be used to treat certain human conditions in small doses, Ivermectin has not been approved to treat Covid.