How Quickly Should Bactrim DS Stop Cystic Acne?

Several tetracyclines have failed ( doxy, mino, solodyn) as have topicals (evoclin, triaz, duac, retin-a, aczone. I started Bactrim DS 3 weeks ago (2x daily) but I am still experiencing new cysts on my back ( none on my face/chest).

How soon should this stop them? Should I still be getting new cysts 3 weeks in ? They are causing raised scars on my chest & back. I am classified as 'moderate cystic acne with very mild rosacea'. My derm has me taking it until July and re-evaluating at that time.

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2 Doctor Answers | Asked by Kilometers in Mesa, AZ

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Bactrim for Acne

Bactrim is not an antibiotic that I typically prescribe for Acne as it is a rather "big gun" antibiotic for serious infections. As it can be very effective for acne, Bactrim has significant side effects such as causing a life threatening rash. However, in severe acne cases I may prescribe it for 1-2 weeks for quick control of severe cystic acne prior to initiating another treatment regimen.

Bactrim and cystic acne

I am generally not in favor of long-term antibiotics for acne so even if Bactrim were helpful, long-term use can cause bacterial resistance and a decrease in effectiveness over time. You may want to discuss the option of Accutane with your dermatologist. While Accutane has its share of potential side effects, it is a consideration when other therapies including oral antibiotics have failed.