My friend has a problem of nasal congestion which lasts about 5 to 6 months in a year.Doctors told that this is due to dust allergy.Accordingly some medicines were prescribed.He is taking vacccine also thrice in a week for the last 4 months but problem is still there.The most concern is that he reguraly takes otrivin nasal spray for temporary relief once in 2 hours.He has been dependent on it.Please let me know what may be the cause behind it and how to resolve.
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