I was doing some antihistamine browsing when she notice that some "sleep" pill have "Diphenhydramine Citrate", while most others, the one she is most used too, has "Diphenhydramine HCL". Is there any major differences between the too in regard to delerient effects? Also, SWIM noticed the use of "Doxylamine succinate" as a antihistamine in the place of Diphenhydramine HCL. Would this antihistamine be a delerient antihistamine, and has any SWIM's had any experience? Thanks in advance!