The efficacy of azithromycin in pityriasis rosea: a randomized, double-blind, placebo-controlled trial.

BACKGROUND Macrolides are prescribed in the treatment of pityriasis rosea despite conflicting results of the limited number of studies evaluating their role in its treatment. AIM A randomized double-blind placebo-controlled trial was conducted to evaluate the effect of azithromycin on the clinical course of pityriasis rosea. METHODS Seventy patients of pityriasis rosea were given either azithromycin (n=35) or placebo (n=35) and were followed-up at 2, 4 and 6 weeks. Pruritus was assessed in both groups using the visual analogue scale (VAS) . Change in the pityriasis rosea severity score (PRSS) and in the VAS were recorded as outcome measures and were compared statistically. RESULTS The decrease in PRSS from baseline through 2, 4 and 6 weeks within both treatment (P<0.001) and placebo (P<0.001) arms was found to be statistically significant; however, this change was not significantly different in the two groups (P=0.179). Similarly, the decrease in VAS was found to be statistically significant within both groups (P<0.001); however, the change was comparable between the two groups (P<0.937). Analysis by Fisher's exact test did not find a significant difference between the two groups for PRSS and VAS. CONCLUSION Azithromycin is not effective in pityriasis rosea and the use of macrolides for this disease should not be encouraged in clinical practice.