Allergic reactions which can develop into a more serious, even life-threatening problem if not treated.
Symptoms include: becoming very wheezy, coughing or having difficulty with breathing; suddenly feeling weak or light-headed (which may lead to collapse or loss of consciousness); swelling around the face, mouth or tongue; skin rashes or redness.
Very common side effects are nose bleeds.
Common are headache, unpleasant taste and smell, dry or painful nose or throat.
Very rare are skin reaction, eye pain or blurred vision and damage to the nose.
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