What do systematic reviews say?

Intramuscular corticosteroids vs oral corticosteroid

Intramuscular corticosteroids showed no clear difference in symptom persistence 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 0.41 [0.14, 1.2]
  3 studies · 80 participants
  Low