Yes, injury on the shoulder has to take some precautions to prevent infection. To prevent it, you have to take a wave-like toxoid vaccine. For infection itself, you will have to prescribe gmentin, which includes a powerful antibiotic, clavialine, and another antibiotic, sepazolin.
Sir, you've got a wound on your shoulder and you're in so much pain that you're gonna have to take the medication to treat it.