I'm not a physician, but worked in healthcare for years, including pharmaceuticals. In addition, I'm a chronic pain patient. My advice, written by his physician of course, would be anti-inflammatories (NSAIDS) and an acid reducer to protect his stomach (such as prescription Prevacid or OTC Pepcid AC). A heating pad applied to the collarbone area may also provide him some relief, as it would relax the muscles surrounding the injury. If he was prescribed pain medication, such as hydrocodone (Vicodin, Lortab, Lorcet), do not give him Tylenol at the same time, as hydrocodone always has either Tylenol (acetaminophen) or Ibuprofen in it, but typically Tylenol. I hope this helps and that he recovers soon.