COVID-19 drugs after U.S. President Donald Trump was treated last week with an experimental therapy from Regeneron Pharmaceuticals Inc, and on Wednesday he promised to make it free to Americans while touting its benefits.Medical experts said more data is needed to assess the treatment’s efficacy before wider use should be allowed.Trump was discharged from the hospital late on Monday, just a few days after being diagnosed with COVID-19 that caused enough lung inflammation for blood oxygen levels to fall.