evidence: Ivermectin has been called a Covid "miracle" drug, championed by vaccine opponents, and recommended by health authorities in some countries. But the BBC can reveal there are serious errors in a number of key studies that the drug's promoters rely on. [...] The group of independent scientists examined virtually every randomised controlled trial (RCT) on ivermectin and Covid - in theory the highest quality evidence - including all the key studies regularly cited by the drug's promoters. [...] But the Lebanon and Iran trials were excluded from a paper for Cochrane - the international experts in reviewing scientific evidence - because they were "such poorly reported studies". The review concluded there was no evidence of benefit for ivermectin when it comes to Covid.