What do systematic reviews say?

Intramuscular corticosteroids vs oral corticosteroid

Intramuscular corticosteroids showed no clear difference in adverse events compared with oral corticosteroids (low certainty).

• Intramuscular versus oral corticosteroids to reduce relapses following discharge from the emergency department for… 2018 · Cochrane Headline outcomes only
  RR 0.83 [0.64, 1.07]
  5 studies · 404 participants
  Low