I Have Become Allergic To BACTRIM Which Is The Best

I have become allergic to BACTRIM which is the best antibiotic I have ever taken for bronchitis. I have chronic bronchitis. I am 65 and I got it the first time @ age 14. I have not smoked for 30 years. And I have not had the bronchitis for just a little over a year which is the longest I have gone without bouts of it. There have been times when I would get bronchitis 3 x a year (changing of seasons). What is the best antibiotic as I am miserable and cannot take BACTRIM any longer.