This is a question for the prescribing physician. Interactions vary from person to person. What may be fine for me may cause you to stop breathing. Don't take a chance, ask your Dr. Hope this helps.
Another good resource is your pharmacist. Coricidin HBP is made to be taken by people with high blood pressure because decongestants can cause a rise in some peoples pressures. As far as the Xanax though, the cold medicine likely has an antihistamine and taking the two together may increase sedation.
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