Anthony Fauci is not among the impressed. The day the study came out, Fauci, the leading infectious-disease expert advising the White House’s coronavirus task force, downplayed the findings as “anecdotal.” The report was not a randomized clinical trial—one in which many people are followed to see how their health fares, not simply whether a virus is detectable. And Oz’s “100 percent” interpretation involves conspicuous omissions. According to the study itself, three other patients who received hydroxychloroquine were too sick to be tested for the virus by day six (they were intubated in the ICU). Another had a bad reaction to the drug and stopped taking it. Another was not tested because, by day six, he had died.

Nonetheless, the day after Raoult’s study was published, Donald Trump tweeted about it: “HYDROXYCHLOROQUINE & AZITHROMYCIN, taken together, have a real chance to be one of the biggest game changers in the history of medicine.” In the days since, Trump has repeatedly returned to this claim. On Saturday, he said that the term game changer wouldn’t even adequately describe the drug: “It will be wonderful. It will be so beautiful. It will be a gift from heaven, if it works.” After downplaying the value of ventilators and social distancing, measures that experts overwhelmingly agree are needed to overcome the virus, Trump said the country would procure 29 million doses of hydroxychloroquine for a national stockpile. He said he may start taking the drug himself.

Read: All the president’s lies about the coronavirus

Over the course of these two weeks, the president of the United States has become the world’s most prominent peddler of medical misinformation. While some very early evidence has shown that hydroxychloroquine may influence the course of COVID-19, Trump is overriding his top medical adviser and minimizing serious risks by encouraging Americans to try the drug right now. This brazen dispensation of medical advice from the president is dangerous in ways beyond the potential harm of the drug itself. A time of strict directives for personal behavior and hygiene requires tremendous trust in those giving the directives—and understanding the reality that this is a disease without a miracle cure. But instead of inspiring trust, Trump has pivoted from downplaying the number of cases in the United States to the extremely effective trick of quack medical providers: hyping an unproven treatment that entices desperate people with false confidence and confusing messaging.

It is unclear how hydroxychloroquine would work to treat COVID-19, but the drug is one of many now being urgently studied for the treatment of the disease. The drugs being tested include those that could block viral replication, such as remdesivir, and others that may target the way the virus binds to human cells. Still other drugs aim to modulate a person’s immune response, among them a class of drugs known as IL-6 inhibitors. Hydroxychloroquine has the theoretical potential to affect the virus itself or the immune response. In addition to treating malaria, hydroxychloroquine is important in the treatment of autoimmune diseases such as rheumatoid arthritis and lupus. In those specific conditions, the drug effectively serves to subdue an overactive immune response.