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A member asked:
Can i take an allegra (fexofenadine) pill about an hour after drinking thera flu?
A doctor has provided 1 answer
Too much : In general I would not advise taking Allegra (fexofenadine) 30 min. after TheraFlu .TheraFlu contains an antihistamine called chlorpheniramine which would last for approximately 4 to 6 hours. So, you should wait that time frame, then it would be safe.
Answered 3/29/2017
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