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  • Title: Adapalene 0.1% gel for the treatment of acne vulgaris: its superiority compared to tretinoin 0.025% cream in skin tolerance and patient preference.
    Author: Dunlap FE, Mills OH, Tuley MR, Baker MD, Plott RT.
    Journal: Br J Dermatol; 1998 Oct; 139 Suppl 52():17-22. PubMed ID: 9990416.
    Abstract:
    One hundred patients with acne vulgaris applied adapalene (Differin) 0.1% gel to one side of their face and tretinoin 0.025% cream to the other once a day for 4 weeks; the side of application was determined by randomization code. Patient tolerance (assessed as the side of the face least irritated by drug application) was recorded weekly and patient preference (assessed as the preparation more easily spread, absorbed more quickly, smelled better, felt best on the skin and least greasy to the feel) at completion of the study. The investigator measured skin irritation weekly, scoring erythema, skin dryness, desquamation and burning/stinging on a 10-point scale. After each week of treatment, 64-68% of patients found adapalene 0.1% gel more tolerable than tretinoin 0.025% cream (P < 0.05). At study completion, 65% of patients preferred adapalene 0.1% gel over tretinoin 0.025% cream (P = 0.003). An overall assessment showed adapalene 0.1% gel was significantly less irritating to the skin in terms of producing erythema, dryness, desquamation and burning/stinging, at Visits 2, 3 and 4 (P < 0.02). Thirty-two patients experienced mild to moderately severe adverse events; three had adverse events considered to be drug related (two with skin discomfort; one with skin dryness). One patient stopped using the study drugs because of dry skin. This study showed that a majority of patients preferred adapalene 0.1% gel over tretinoin 0.025% cream and that it caused significantly less skin irritation.
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