Hi thanks for your question.
is combination of ciprofloxacin
and dexamethsone.There are few side effects of ciprodex which include ear debris,ear discomfort,(feeling of fullness or plugging in ear) itching,ear pain
and over growth of fungi or other bacteria in affected ear .These side effect can give rise to muffled hearing.The other possibility could be ear drum perforation due to infection.Reconsult your treating ENT specialist
who may examine your ear to determine cause of muffled hearing .
Hope this answers your question.