馬上服Benadryl二片，嚼碎見效快, 少了不行。洗熱水澡。要是喘不上氣，馬上打911

https://www.healthychildren.org/English/safety-prevention/at-home/medication-safety/Pages/Diphenhydramine-Benadryl-Antihistamine.aspx
Adult dose: 50 mg