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Another possible scenario is maybe the antibiotic dose is not enough. It's quite hard to give a definite period as to whether tetracycline will work for you or not since you didn't tell how much was prescribed and how severe your acne is.
A typical tetracycline regimen for treating moderate to severe acne starts with a dose of 500 to 1000 milligrams a day, which is decreased as improvement occurs. Long-term, low-dose tetracycline therapy may be continued for many months to suppress acne. Higher doses may be prescribed for very severe acne.
Now, if the dose given is enough for the type of acne you have and yet, there's no noticeable improvement over a long period of time, then you might want to consider another acne regimen.
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