What do systematic reviews say?

Intervention not reported

It is very uncertain whether the intervention changes adverse events－serious events Budesonide/formoterol (BDF) versus… (very low certainty).

• Combined corticosteroid and long‐acting beta₂‐agonist in one inhaler versus inhaled corticosteroids alone for chronic… 2013 · Cochrane Headline outcomes only
  OR 0.93 [0.72, 1.21]
  3 studies · 1469 participants
  Very low