The US Food and Drug Administration approved leucovorin, but not for what White House had recommended for in its September briefing. FDA has approved the prescription drug leucovorin for cerebral folate deficiency in the receptor 1 gene, a genetic condition that is estimated to affect only about 1 in 1 million people. In September, the White House touted leucovorin as a potential treatment for children with autism. Health and Me previously reported on how parents were struggling to find the prescription drug, while not enough scientific evidence was there to support the claim. What Is Leucovorin?It is a high-dose B vitamin, which is commonly used as a treatment to counteract the side effects of chemotherapy. It has been approved by the FDA for cerebral folate deficiency in the receptor 1 gene. The disease is rare and fewer than 50 cases have been identified worldwide. FDA Commissioner Dr Marty Makary called this approval "a significant milestone" for patients with the condition. However, in September last year, Markary and US Health and Human Services Secretary Robert F Kennedy Jr said that the drug could help children with autism. Kennedy, standing next to US President Donald Trump, said, they had "identified an exciting therapy that may benefit large number of children who suffer from autism."CNN reported that in Austin, Texas, Meagan Johnson, a mother with an autistic son of three years of age, spent four days calling pharmacies across the region searching for leucovorin. She contacted nearly 40 pharmacies around her home in Pflugerville, hoping to locate the medication. Health and Me reported how getting the prescription turned out to be far harder than obtaining it.This update on leucovorin, notes CNN have hit some families hard, especially the families of children with autism. This is because of the September briefing and when Trump also said that painkiller Tylenol could in fact cause autism. The drug leucovorin was used as something that could give them hope, however, with the update in its label, parents efforts to find the prescription drugs could feel like in vain. The Rare Condition For Which Drug Got Its Approval The drug got its approval for folate deficiency in the receptor 1 gene. This is a defect that causes proteins that guide folate into the brain to malfunction. As a result, normal levels of folate is found in the blood, but not in the brain or nervous system, due to which tasks like thinking, speech and movement could not be performed.In an op/ed published in Politico and reposted on the White House website last fall, Markary said that his agency would "approve prescription leucovorin as a treatment for children with cerebral folate deficiency and autistic symptoms". However, he did not that it cause not a cure for autism, but there have been studies that show that it could help children with folate deficiency and autism to improve speech by roughly 60 per cent. The Trump administration made a bold move to expand the usage of the drug by "opening the door to the first FDA-recognized treatment for autism." wrote Markary and other HHS leaders.