Bronchiolitis is a prevalent disease in children under two years of age, which carries significant morbidity and mortality. However, there is controversy regarding the optimal therapeutic management. Leukotriene inhibitors have been proposed as an alternative, although its efficacy is not clear yet. Searching in Epistemonikos database, which is maintained by screening multiple databases, we identified two systematic reviews comprising six trials addressing the question of this article. We extracted data, combined the evidence using meta-analysis and generated a summary of findings following the GRADE approach. We concluded leukotriene inhibitors might not decrease mortality levels on bronchiolitis patients and it is not clear whether they decrease length of hospital stay. They might reduce recurrent wheezing, but the certainty of the evidence is low, and they increase adverse effects.