Benzoyl Peroxide 5% w/w is a topical antimicrobial and keratolytic agent, considered a first-line treatment for mild to moderate inflammatory acne vulgaris in the Indian clinical setting. It is available over-the-counter (OTC) in various formulations like gels, creams, and washes. It exerts its effect by releasing free radical oxygen which is bactericidal against Cutibacterium acnes (formerly Propionibacterium acnes), and by promoting desquamation of the stratum corneum, preventing follicular occlusion.
Adult: Apply a thin layer to affected areas once daily, preferably in the evening. Frequency may be increased to twice daily (morning and evening) as tolerated.
Note: 1. Wash and gently pat dry the affected area. 2. Apply a pea-sized amount for the entire face or a thin layer to other areas. 3. Avoid contact with eyes, lips, nostrils, and mucous membranes. 4. Start with alternate-day application to assess tolerance, then increase to daily use. 5. Use a non-comedogenic moisturizer and broad-spectrum sunscreen (SPF 30+) during the day.
Benzoyl Peroxide exerts a three-pronged mechanism: 1) Antimicrobial: It decomposes on the skin to release free radical oxygen, which is bactericidal against the anaerobic bacterium Cutibacterium acnes, a key pathogen in acne pathogenesis. 2) Keratolytic/Comedolytic: It promotes mild desquamation (peeling) of the stratum corneum and reduces follicular hyperkeratinization, helping to unclog pores. 3) Anti-inflammatory: It may reduce the production of pro-inflammatory free fatty acids in the sebum.
Pregnancy: US FDA Pregnancy Category C. Animal studies are lacking. No well-controlled studies in pregnant women. Use only if the potential benefit justifies the potential risk to the fetus, considering minimal systemic absorption.
Driving: No effect on ability to drive or operate machinery.
| Topical Tretinoin/Retinoids | Concurrent application may cause significant irritation and degradation of tretinoin. Space applications by several hours (e.g., retinoid at night, BPO in morning). | Major |
| Topical Sulfur, Resorcinol, Salicylic Acid | Increased risk of excessive skin dryness and irritation. | Moderate |
| Photosensitizing Drugs (e.g., Tetracyclines, Fluoroquinolones) | BPO may increase skin sensitivity, potentially enhancing photosensitivity reactions. | Moderate |
| Aminolevulinic Acid (for photodynamic therapy) | BPO can inactivate aminolevulinic acid. Discontinue BPO 24-48 hours before procedure. | Major |
Same composition (Benzoyl Peroxide (5% w/w)), different brands: