What do systematic reviews say?

Maintenance LTRA vs placebo

Maintenance LTRA showed no clear difference in withdrawals ‐ Total number of withdrawals compared with placebo (moderate certainty).

• Leukotriene receptor antagonists as maintenance and intermittent therapy for episodic viral wheeze in children 2015 · Cochrane Headline outcomes only
  OR 0.87 [0.66, 1.13]
  2 studies · 1729 participants
  Moderate