Overview
Benzoyl peroxide is a topical antimicrobial agent used primarily for the treatment of acne vulgaris. It works by reducing Propionibacterium acnes bacteria on the skin and promoting skin cell turnover. Treatment typically involves once-daily to three-times-daily application to affected areas.
Mechanism of Action
Benzoyl peroxide exerts antibacterial effects against Propionibacterium acnes through the release of free oxygen radicals. It also has mild comedolytic and anti-inflammatory properties by promoting desquamation of the stratum corneum.
Indications
- Treatment of acne vulgaris
- Management of inflammatory and non-inflammatory acne lesions
Common Doses
- 2.5%
- 5%
- 10%
Dosage
Apply a thin layer to affected areas once daily initially, may increase to 2-3 times daily as tolerated. Cleanse skin thoroughly before application. Reduce frequency if excessive dryness or peeling occurs.
Black Box Warning
None
Contraindications
- Hypersensitivity to benzoyl peroxide or any component of the formulation
Side Effects
- Skin dryness
- Peeling
- Erythema
- Burning sensation
- Pruritus
- Contact dermatitis
- Skin irritation
Interactions
- Concomitant use with other topical acne medications (retinoids, salicylic acid) may increase skin irritation
- May inactivate tretinoin if applied simultaneously - separate application times
Counseling Points
- Apply sunscreen when going outdoors as benzoyl peroxide may increase photosensitivity
- Start with once-daily application to assess tolerance
- Use non-comedogenic moisturizers if dryness occurs
- Avoid excessive washing or scrubbing of treated areas
- Results may take 4-8 weeks of consistent use