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Responses (1) takes 24 hours for antibiotic to start working but it could take several days to feel better. You didnt say why you were taking it, it is used alot for urinary tract infections and bladder infections. If this is the case you should drink as much water as you can and this will help also.
Best Answer: antibiotics can start providing relief anywhere from 12 to 72 hours after you start taking them. Dental infections can be hard for the antibiotics to reach so its not uncommon to have wait a couple of days after starting the medication to see results.