Correct!
Amoxicillin 500mg TID for 10 days
This is a good choice as a first line therapy for bacterial rhinosinusitis. It has good coverage against gram +ves and some gram -ve organisms. These include S. pneumoniae, non β-lactamase resistant H. influezae, and Staphylococcus
You write a prescription for the medication and tell the patient to return if the symptoms don't begin to resolve within the next 3-5 days.