Most side effects of flunisolide nasal spray are mild and do not need medical intervention. These include an unusual taste after using the spray and a brief stinging sensation. Some people have reported cough, dry nose, sore throat, nausea and nosebleeds while using the spray. More serious side effects that call for immediate medical attention include: reduced ability to smell, an irritated nose, recurring nosebleeds, unusual amounts of sneezing, weak muscles and unexpected weight gain, particularly in the head and neck areas. See a doctor immediately if you experience an allergic response. Symptoms may include breathing difficulty, facial swelling, itching, hives or a rash.
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