otrivin is not a good meidcine is very harmful for nasal mucosa , it shoud be used for a very short period of time not extending beyond one week other wise it causes rhinitis medicamentosa leading to hypertrphy of nasal mucosa which is difficult to revert back, resulting in constant feeling of nasal congestion.
other reason for recurrent nasal congestion is that u might had deveoped sinusitis post covid .
kindly discuss ur complete symptoms with me for reaching a conclusion
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feel free to consult for further advice, and prescription