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This is Dr. David
Bromfed DM contains brompheniramine, dextromethorphan, and pseudoephedrine.
it is most likely the pseudoephedrine which is causing you to be restless
the dextromethorphan and brompheniramine can cause you to be tried.
if you are still coughing, you should see at doctor at the A&E or hospital or at an urgent care center.
you might need a sputum culture and chest xray
and a course of antibiotics and prescription cough medications which could help.
you have to let the pseudophedrine wear off which can take 8-12 hours.
are you coughing up sputum?
do you have a hospital or ER close to you?