A drug that's been used for more than a decade to treat cancer could cure people with Covid-19, according to a new study. The drug, called pralatrexate, is a chemotherapy medication that was originally developed to treat lymphomas – tumours that originate in the glands. Chinese researchers found pralatrexate outperforms remdesivir, which is currently the leading anti-viral medication used to treat Covid-19 patients. Pralatrexate was approved by the US Food and Drug Administration in 2009 for patients with terminal disease in spite of its toxicity. Adverse effects of pralatrexate include fatigue, nausea and mucositis – inflammation and ulceration of the mucous membranes lining the digestive tract.