What do systematic reviews say?

Intermittent LTRA vs placebo

Intermittent 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 1.03 [0.79, 1.35]
  2 studies · 1402 participants
  Moderate