By Dr. Bowon Lee (Dr. Sly Fox)
Spring Day Clinic Sinchon-Hongdae, Seoul, Korea
In Part 2, we explored the differences between doxycycline, minocycline, and sarecycline.
Now let's discuss another question patients frequently ask.
"My previous clinic prescribed roxithromycin instead of doxycycline. Was that the wrong choice?"
Or,
"I thought doxycycline was the standard treatment. Why was I given a different antibiotic?"
These are excellent questions—and the answer is more nuanced than many people realize.
Tetracyclines Remain the Standard First-Line Therapy
Let's begin with the most important point.
According to current international acne treatment guidelines, tetracycline antibiotics remain the preferred first-line oral antibiotics for most patients with moderate to severe inflammatory acne.
These include:
- Doxycycline
- Minocycline
- Sarecycline
They have been extensively studied and continue to provide the strongest evidence for effectiveness in inflammatory acne.
So where do macrolide antibiotics fit into modern acne treatment?
Macrolides Still Have an Important Role
Macrolide antibiotics are not "bad" medications.
They simply serve a different purpose.
The most commonly encountered macrolides include:
- Roxithromycin
- Azithromycin
- Clarithromycin
- Erythromycin
Although they belong to the same antibiotic family, each has its own pharmacologic characteristics, dosing schedule, and clinical considerations.
Why Would a Physician Choose Roxithromycin?
Roxithromycin is still prescribed in some countries for selected acne patients.
A physician may consider it when:
- Tetracyclines cannot be used
- Previous tetracycline therapy caused unacceptable side effects
- Individual patient circumstances make an alternative antibiotic more appropriate
Roxithromycin has relatively good tissue penetration and is generally well tolerated by many patients.
However, it is important to understand that current international guidelines do not recommend roxithromycin as the routine first-line oral antibiotic for acne.
Instead, it is considered an alternative option in selected clinical situations.
What About Azithromycin?
Azithromycin has a very long half-life, allowing for flexible dosing schedules.
Some physicians have used intermittent treatment regimens, such as several doses per week rather than daily administration.
Research has shown that azithromycin can improve inflammatory acne in some patients.
However, when compared with doxycycline, current evidence has not consistently demonstrated superior outcomes.
For this reason, azithromycin is generally reserved for situations in which tetracyclines are not appropriate or cannot be tolerated.
Clarithromycin and Erythromycin
Clarithromycin has also been investigated for acne treatment and may be effective in selected patients.
However, physicians should remain aware of its potential for drug-drug interactions, particularly in patients taking multiple medications.
Erythromycin played a much larger role in acne management decades ago.
Today, its use has declined considerably.
The main reason is antibiotic resistance.
Over time, Cutibacterium acnes has developed increasing resistance to erythromycin in many regions of the world, reducing its usefulness as a routine acne treatment.
This illustrates an important principle in modern dermatology:
The goal is not simply to eliminate bacteria.
The goal is to preserve antibiotic effectiveness whenever possible.
"My Antibiotic Doesn't Seem to Be Working."
This is another concern I hear frequently.
Many patients become discouraged after one or two weeks and assume the medication has failed.
In reality, inflammatory acne improves gradually.
Most oral antibiotics require several weeks before meaningful improvement becomes apparent.
A typical timeline often looks like this:
- Weeks 1–2: Little visible improvement
- Weeks 3–4: Inflammation begins to decrease
- Weeks 6–8: More noticeable clinical improvement
- After reassessment: Continue, taper, or transition depending on response
Changing antibiotics too early may interrupt a treatment that simply hasn't had enough time to work.
For that reason, physicians usually evaluate both clinical response and treatment duration before deciding whether a medication should be changed.
Modern Acne Treatment Is About Combination Therapy
One of the biggest changes in acne management over the past decade is the emphasis on combination therapy.
Oral antibiotics should rarely be viewed as a complete treatment by themselves.
Instead, they are typically combined with evidence-based topical therapies such as:
- Benzoyl peroxide (BPO)
- Topical retinoids (such as adapalene)
- Azelaic acid, when appropriate
This approach helps improve treatment outcomes while reducing the risk of antibiotic resistance.
In other words,
the success of acne treatment depends less on choosing the "perfect antibiotic" and more on building the right overall treatment strategy.
Individualized Medicine Always Comes First
At Spring Day Clinic Sinchon-Hongdae, every acne consultation begins with the same principle.
Rather than asking,
"Which antibiotic should everyone receive?"
I ask,
"What treatment will provide the greatest benefit for this specific patient?"
That answer may differ from one person to another.
Personalized medicine has always been at the heart of effective dermatologic care.
Coming Up in Part 4
In the final article of this series, we'll answer some of the most common questions patients ask about oral antibiotics:
- How long should antibiotics be taken?
- Does long-term use really cause antibiotic resistance?
- When should antibiotics be changed?
- When is it time to stop antibiotics and transition to maintenance therapy?
- When should isotretinoin be considered instead?
We'll bring everything together into a practical guide for patients who want to understand how modern acne treatment is actually planned.
Dr. Bowon Lee (Dr. Sly Fox)
Spring Day Clinic Sinchon-Hongdae
"Choosing the right antibiotic is only one piece of the puzzle.
Successful acne treatment comes from a personalized, long-term strategy."
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