i have some smz/tmp ds 800 from 2009-is it still okay to use for possible uti?
I realize this question is probably not relevant to the original asker, however it is a common question. Using expired, leftover antibiotics is not advisable. For one thing, the dosage you may have might be sub-therapeutic - that is, there might not have enough left to do the job. If someone takes sub-therapeutic doses of antibiotic, they run the risk of not killing off all the infection. This can cause the ones that remain to mutate into having a resistance to the antibiotic. Also, antibiotics are relatively unstable as far as shelf life. It is always best to see a doctor and get a prescription that is targeted for the actual infection in the correct quantity to ensure it completely kills off the pathogens.
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