Re: Why do Antihistamines Speed me up?
I don't know the medical term for it either but some people are just more sensitive to antihistamines. Most of the PM meds contain benadryl (diphenhydramine). That's what helps you to sleep. A possible side effect of benadryl is heart palpitations, increased BP, nervousness, etc. Since you are sensitive to it, I suggest you stay away from them or take a decreased dosage. I find I can tolerate the suggested child's dosage for some OTC medications. I wish you well.