Tretinoin Treatment Guidelines for Acne

Introduction to Tretinoin Therapy

• The American Academy of Dermatology recommends applying tretinoin once nightly as a thin layer to completely dry skin, starting with every-other-night application if skin is sensitive, and always combining with benzoyl peroxide in the morning as part of multimodal therapy—never using tretinoin as monotherapy 1, 2

Application and Dosing Strategy

• For mild acne, the guideline society recommends starting with adapalene 0.1% or tretinoin 0.025-0.05% once nightly, combined with benzoyl peroxide 2.5-5% gel applied in the morning 4, 2
• For moderate acne, use tretinoin 0.025-0.1% nightly plus benzoyl peroxide 2.5-5% in morning, adding topical antibiotic in fixed-dose combination with benzoyl peroxide if inflammatory lesions present 4, 2

Sun Protection and Maintenance

• Minimize sun exposure, use sunscreen and protective clothing when outdoors—tretinoin causes heightened photosensitivity 3
• After achieving clearance, continue tretinoin indefinitely to prevent recurrence, reducing to once weekly to three times weekly application for long-term maintenance 3
• Benzoyl peroxide can also be continued as maintenance 2

Contraindications and Precautions

• Pregnancy prevention is mandatory for persons of childbearing potential—tretinoin is pregnancy category C with no established safety in pregnant women 3
• Not established for use in children under 10 years of age 3

Therapy Considerations

• Never use topical antibiotics without concurrent benzoyl peroxide—resistance develops rapidly 4, 2
• Avoid chemical peels within 6 months of any retinoid therapy 3