A 6-month open-label, prospective, noncomparative trial in 320 patients (mean age 17.7 years) with moderately severe acne vulgaris were enrolled in a trial of fixed low-dose isotretinoin (20 mg on alternate days) and twice daily topical clindamycin gel. The primary efficacy endpoint was the percentage reduction of total acne load between baseline and at the end of 6 months. Results were graded as "very good" (> 80% reduction of lesions) and "good" (50-80% reduction); such results were regarded to be clinically significant. "Very good" and "good" results were seen in 68.20 and 19.34% of patients, respectively. Failure was seen in 12.46% and relapse occurred in 16.39%. Mild cheilitis and xerosis were ...