Sulfamethoxazole / trimethoprim
"My doctors would always give me amoxicillin.  It never did anything.  I use to have a bad bronchitis every winter.  I had one that lasted months.  My sputum turned deep brown, my middle ears were so infected I could barely hear.  And I was not a smoker then.  I called my ENT office off hours.  I got another doctor on the call.  He was older and very thorough in trying to diagnose over the phone.  He said lets try a real old drug.  It was Sulfa not the combo Bactrim.  He called the pharmacy.  A friend picked it up.  the pil was huge.  I broke it in three pieces to get down with lots of water. Tthe next day was like a miracle, I felt so much better.

It seems Sulfa is all around gold standard antibiotic for me for any infection"