Diphenhydramine: should be used with great caution if at all. It stops working after a few days and increasing doses can cause hallucinations, confusion and even death. There is an increased risk of seizures especially in young people. You need the specialized care of a head injury specialist. 4th concussion? Are you a gladiator? I hope you are not planning on playing hockey real soon. (Gravol is a Canadian med)
Answered 5/18/2016
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