Montelukast as an effective adjuvant in the treatment of moderate acne vulgaris.

Although antibiotics are among the most commonly used treatments of acne, there are refractory cases, or they can cause some complications. Recently, leukotriene B4 has been found to play a major role in inflammatory acne lesions. This double blind, randomized clinical trial was conducted on 108 patients with acne who needed systemic therapy and referred to dermatology clinics affiliated to Shiraz University of Medical Sciences. One group (53 patients) received 100 mg doxycycline daily plus placebo and the other group (55 patients) received 100 mg daily doxycycline plus 10 mg daily montelukast. Both groups also received topical benzoyl peroxide 5% every other night. The study period was 3 months and the patients were investigated by lesion count, investigator global assessment (IGA), global acne grading system (GAGS), and Cardiff acne disability index (CADI) scoring systems. Total lesion count, inflammatory lesion count, and non-inflammatory lesion count as well as IGA and GAGS decreased in both treatment groups. At the end of the study, however, the inflammatory lesion count and IGA score reduced more significantly in the montelukast group (p = 0.018 and 0.045, respectively). In addition, the two groups were significantly different with regard to the percentage of decrease in the total lesion count, inflammatory lesions, and IGA (p = 0.033, 0.003, and 0.044, respectively). Thus, montelukast can be used as an adjuvant therapy besides other treatments of acne, especially for inflammatory lesions.