It's not harmful. But prefer to reduce the dosage when the symptoms are not present. Also I suppose that you have been prescribed that medicine for allergies. The best way to reduce symptoms is to reduce exposure to the things you are allergic to. Proper covering of nose and throat from dust will prevent the entry of particles into your nose and reduce your symptoms. A topical nasal spray also helps to reduce the frequency of your symptoms. Visit a nearby ent specialist for proper prescription of your medication,