Administering 0.4 mg epinephrine subcutaneously
Removing the stinger with tweezers may have caused additional venom to be released into the body. This would increase the severity of the reaction, as seen with the nausea, syncope, and breathing difficulties. Therefore the priority intervention would be to administer epinephrine to treat the reaction. Cool compresses, administering diphenhydramine, and elevating the arm are all appropriate treatments if the reaction is mild, that is, stinging, swelling, headache, and so forth.
p. 1640