I am prescribed Allegra and took one five hours ago but it doesn't seem to be working. Can I take diphenhydramine HCI 25mg now?
Wolf; Sorry nobody seen your question as of yet now its been a day but just for the record it would not of hurt except make you more tired. But it is best to take one or the other during a 12 hour period. So you know for next time. Have a good day
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