Drug interactions
Tretinoin + Urea
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Overview
Concurrent topical use may lead to increased irritation and peeling; urea can enhance penetration of tretinoin, increasing local adverse effects.
Mechanism of action
Pharmacodynamic additive irritation from retinoid plus keratolytic; urea-mediated increase in stratum corneum permeability may raise local tretinoin exposure.
Clinical management
Avoid co-application on the same area; consider alternating days or spacing applications (e.g., urea AM, tretinoin PM). Initiate with low frequency; moisturize and monitor for irritation; hold or reduce if dermatitis occurs.
Drug reference
References
- Tretinoin (topical) Prescribing Information (Retin-A) — FDA Label
- Urea (Topical) monograph — Lexicomp
- Topical retinoids: Pharmacology, adverse effects, and use — UpToDate
Frequently asked questions
Can I take Tretinoin with Urea?
The interaction is rated: Moderate. Concurrent topical use may lead to increased irritation and peeling; urea can enhance penetration of tretinoin, increasing local adverse effects.
How serious is the interaction between Tretinoin and Urea?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between Tretinoin and Urea managed?
Avoid co-application on the same area; consider alternating days or spacing applications (e.g., urea AM, tretinoin PM). Initiate with low frequency; moisturize and monitor for irritation; hold or reduce if dermatitis occurs.
Why do Tretinoin and Urea interact?
Pharmacodynamic additive irritation from retinoid plus keratolytic; urea-mediated increase in stratum corneum permeability may raise local tretinoin exposure.
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