IM epinephrine (not SC)  for severe urticaria.
Muncie
Herbert L
HL
D004837:Epinephrine / Q000008:administration & dosage*; D006801:Humans; D007273:Injections, Intramuscular; D007279:Injections, Subcutaneous; D014581:Urticaria / Q000188:drug therapy*; D014662:Vasoconstrictor Agents / Q000008:administration & dosage*
D014662:Vasoconstrictor Agents; D004837:Epinephrine