M.H.
My teenage son had a pretty serious photo sensitivity reaction to another antibiotic. It took several weeks to clear up too. They told him to use sunscreen, but I don't think that worked. I would keep him out of the sun until you can see how he's tolerating it, or wear hats and long pants and sleeves. Everyone is different--some people have no problems with it. My son was told not to take the antibiotic again that caused his problem. Good luck!