How long does it take for tetracycline to work?

Some people may notice improvement in their acne within 4 to 6 weeks. However, if there is no improvement in your acne after you have used this medicine for 6 to 8 weeks or if it becomes worse, check with your health care professional. The treatment of acne may take up to 8 to 12 weeks before full improvement is seen.Feb 1, 2021

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