William Warren plays Louis, a mostly-sympathetic scoundrel. He is a womanizer and gambler who has some medical school but lacks the discipline necessary to finish. David Landau shines in a supporting role: a washed up, morphine-addicted doctor who sells Louis his medical license for cash and a lifetime supply of morphine fixes. (The bio on Landau says "wooden." He doesn't seem so here.) Louis' ego and greed propel him to increasing medical risks. You know that sooner or later his ineptitude will result in death. The only question is "Whose?"
This movie was made when physician advertising was considered highly unethical. But Louis cleverly bends the rules! It was also made when the dangers of radiation exposure were unknown; notice that none of the characters in the X-ray room wear any protection.