What do systematic reviews say?

Intermittent ICS vs placebo

Intermittent ICS showed no clear difference in exacerbations requiring oral corticosteroids ‐ adults compared with placebo (low certainty).

• Intermittent inhaled corticosteroid therapy versus placebo for persistent asthma in children and adults 2015 · Cochrane Headline outcomes only
  OR 0.1 [0.01, 1.95]
  1 study · 240 participants
  Low