Mometasone nasal spray, also known by the brand name Nasonex, is a corticosteroid spray which can be used to treat hay fever and other types of allergies, according to MayoClinic.com. Nasonex is available in an inhaler and is used once a day. It typically takes several weeks of regular use of the medication for full relief of the nasal congestion, itchy and runny nose, and sneezing associated with these allergies. Nasonex, like all medications, has some side effects.
Nosebleeds
A person using Nasonex may experience nosebleeds or blood-tinged mucus. This side effect occurred in 11 percent of the patients with allergic rhinitis in the clinical trials for this medication, according to DailyMed. According to MayoClinic.com, patients should alert the prescribing physician as soon as possible if nosebleeds occur.
Viral Infections
Patients taking Nasonex may also develop viral infections. These occurred in 14 percent of clinical trial patients, according to DailyMed. These symptoms should be reported to the doctor for further management.
Muscle and Bone Pain
Some patients using Nasonex develop muscle or bone pain which occurred in about 5 percent of patients during the clinical trials, according to DailyMed. Patients who develop these symptoms should alert the prescribing physician as well for further evaluation.
Headache
Headache is a common side effect of Nasonex. DailyMed says headache occurred in 26 percent of patients taking Nasonex during the allergic rhinitis clinical trials. The headaches should improve as the body adjusts to the medication but patients should still speak to the physician if there are any questions.
Increased Cramping During the Menstrual Cycle
Some women develop increased pain during the menstrual cycle while taking Nasonex. DailyMed says about 5 percent of women developed this side effect during the clinical studies. Women who experience this side effect should speak with the doctor as soon as possible.
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