Shoulder pain

My son has been dealing with shoulder pain. He had xray done, nothing showed up. Just had MRI last nite and we don't have results yet. His ortho doc gave him samples of ZORVOLEX 35 mg. once a day. I was reading the drug interactions and I'm a bit concerned. My son takes Baclofen, Ditropan XL, Hippurex, enemeeze. Does anyone have any
Input? It's Friday and I want him to get some relief over the weekend! Thanks!!!

Shoulder pain