Yes antibiotic treatment does cause bacteria to become immune to the antibiotic. Acne treatment is the biggest cause of antibiotic resistance because the doses are low and over a long period of time. There are many antibiotics that can be used to treat acne including tetracylcines (there are many), erythromycin, clindamycin etc. I would say it is best not to be on one antibiotic for more than 12months, ideally no more than 6 months. If there is no improvement are 3 months go back to your GP and he will revise the treatment, otherwise after 6 months as the doctor if it would be advisable to switch to another antibiotic or possibly to a topical antibiotic (applied direct to skin with acne). Topically applied antibiotics (in creams and gels) cause less antibiotic resistance, especially if combined with benzoyl peroxide which kills bacteria but the bacteria cannot become resistant to it. Hope this has helped.
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Chris
5W Network