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Dapsone gel is what I reach for when someone's skin cannot take a retinoid and benzoyl peroxide is too drying. It is gentle, it works on the inflamed spots rather than the blackheads, and it is a dependable choice for adult women and for deeper skin tones where irritation leaves marks behind.
The line I repeat: it is not a substitute for a retinoid if you can tolerate one, and it does almost nothing for blackheads. Also, if you apply benzoyl peroxide at the same moment, expect a temporary orange tinge. It washes off and it is harmless.
— Dr. Schwarz, Board Certified Dermatologist
Key Facts
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| Also called | Aczone |
| Drug class | Topical sulfone, anti-inflammatory |
| Applied as | Gel, 5% or 7.5% |
| Typical course | Long term while acne is active |
| Time to work | 4 to 12 weeks |
| Prescription only | Yes |
What It Is
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Dapsone gel is a prescription gel for acne. Dapsone itself is an old drug, taken by mouth for leprosy and for certain blistering skin diseases. The gel puts a small amount on the skin only, where it acts mainly as an anti-inflammatory. It is approved for acne from age nine or twelve, depending on the strength.
How It Works
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Dapsone dampens the immune cells that make acne spots red and sore, mainly by interfering with how neutrophils, a type of white blood cell, generate inflammation. It has some effect on bacteria too, but the anti-inflammatory action is the useful one in acne. The common assumption is that it is an antibiotic like clindamycin. It is not, and that matters. It does not appear to drive antibiotic resistance the way topical antibiotics do, so it does not have to be paired with benzoyl peroxide for that reason.
What It Treats
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Each grade is the same one shown on that condition’s page.
Forms and Strengths
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Dose
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Dose here means strength and frequency, not milligrams.
How to Take It
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When to take it: On clean dry skin, to the whole affected area. The once-daily strength is usually used in the morning so a retinoid can go on at night. It dries clear and sits well under makeup and sunscreen.
If you miss a dose: Skip it and resume normally. Do not double up.
What to Expect
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Side Effects
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Very well tolerated. Whole-body effects are rare, because little is absorbed.
Common — expected, and they settle
- Mild dryness, redness or an oily feel at the site. Temporary yellow-orange discoloration of skin or light-colored facial hair if benzoyl peroxide is applied at the same moment. It washes off.
Tell your doctor — worth a call, not an emergency
- Rash, or unusual tiredness. In people with G6PD deficiency, an inherited enzyme problem, red blood cells are more fragile. With the gel this has not caused clinically important problems in studies, but symptoms are still worth reporting.
Stop and get care
- Blistering, peeling or a spreading rash. Shortness of breath, very pale skin or blue-tinged lips. These are rare and need same-day assessment.
What to Avoid
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- Applying benzoyl peroxide at the same moment, unless a temporary orange tint does not bother you. Use them at different times of day.
- Oral dapsone at the same time, unless a specialist has planned it.
- There is no food or alcohol interaction.
- It is not a photosensitizer, so no extra sun restriction beyond ordinary sunscreen.
Monitoring
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No routine blood tests for the gel. Testing for G6PD deficiency is not required before starting it, unlike with dapsone tablets, because so little is absorbed.
Long term, this is a drug people can stay on for years. Nothing accumulates. Review is clinical, at about twelve weeks and then yearly.
If You Stop
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No rebound and no taper. Inflammation returns to its previous level, and red spots usually come back within weeks to a couple of months.
Cost
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Generic dapsone gel is available in both strengths and has brought the price down considerably, though it still costs more than generic clindamycin or benzoyl peroxide. Some plans still ask for prior authorization, usually after a retinoid has been tried.
Who Should Avoid It
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Do not take
- Known allergy to dapsone or to sulfones That is the only absolute barrier for the gel.
Take with care
- Pregnancy Safety is not established, though absorption is low. It is a decision to make with the doctor managing the pregnancy.
- Other conditions G6PD deficiency or any inherited anemia means telling your doctor, though the gel has been used in these patients without important problems.
- Other medicines Oral dapsone or trimethoprim-sulfamethoxazole taken at the same time raises total exposure and is worth flagging.
How It Compares
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FAQ
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Why did my face turn orange?
Benzoyl peroxide and dapsone applied together can leave a temporary orange-brown tint on skin and light-colored facial hair. It washes off and is harmless. Use them at different times of day.
Do I need a G6PD test first?
Not for the gel. That requirement belongs to dapsone tablets, where far more of the drug reaches the bloodstream.
Will it clear my blackheads?
No. It works on inflammation. Blackheads need a retinoid.
Is it an antibiotic?
No. It is a sulfone with anti-inflammatory action, which is why resistance is not the same concern.