Any ANALGESIA or sedation for tawny owl

I am a new rehabilitator and found this tawny owl with a broken wing. I have started treating and fixing the wing. However, he is restless and nervous. He undresses his wound. I think If he is injected with a sedative in the right dose, he will calm down for a few days. In this way, the fracture can heal. any suggestion? thanks in advence