mometasone is a prescription medication usedto treat asthma, allergies, and skin conditions. mometasone is in a class of medications calledcorticosteroids. it works by decreasing swelling and irritation in the airways to allow foreasier breathing. mometasone comes in several forms, including an inhaler, a nasal spray,a cream, a lotion, and an ointment. the nasal spray and inhaler are used once or twice daily.mometasone cream, lotion, and ointment are applied to the skin, usually once daily. commonside effects include headaches, viral infections, sore throat, and nosebleeds. for more informationon this medication and all other medications, explore the rxwiki encyclopedia on the webor on your mobile device.