Hi, my name is Desiree'. I am inquiring to find out if I can use a antibiotic that I have on hand instead of having to go to the doc because of my extenuating circumstances.. I have a bad head and chest cold, possibly bronchitis due to the symptoms that I have being the same as the ones I had on a previous occasion. The antibiotic that I have on hand is SULFAMETH/TRIMETHOPRIM 800/160. I have 16 of them.